Implement UI scaling and more (#501)

**New Features**
 * Runtime font accessors and new symbol fonts for text, launcher, statusbar, and shared icons.
 * Added font height base setting to device.properties
 * Text fonts now have 3 sizes: small, default, large

**Improvements**
 * Renamed `UiScale` to `UiDensity`
 * Statusbar, toolbar and many UI components now compute heights and spacing from fonts/density.
 * SSD1306 initialization sequence refined for more stable startup.
 * Multiple image assets replaced by symbol-font rendering.
 * Many layout improvements related to density, font scaling and icon scaling
 * Updated folder name capitalization for newer style

Platforms/platform-esp32/include/tactility/bindings/esp32_gpio.h

@@ -0,0 +1,26 @@
+// SPDX-License-Identifier: Apache-2.0
+#pragma once
+
+#include <tactility/bindings/bindings.h>
+#include <tactility/bindings/gpio.h>
+#include <tactility/drivers/esp32_gpio.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#define GPIO_ACTIVE_HIGH GPIO_FLAG_ACTIVE_HIGH
+#define GPIO_ACTIVE_LOW GPIO_FLAG_ACTIVE_LOW
+
+#define GPIO_DIRECTION_INPUT GPIO_FLAG_DIRECTION_INPUT
+#define GPIO_DIRECTION_OUTPUT GPIO_FLAG_DIRECTION_OUTPUT
+#define GPIO_DIRECTION_INPUT_OUTPUT GPIO_FLAG_DIRECTION_INPUT_OUTPUT
+
+#define GPIO_PULL_UP GPIO_FLAG_PULL_UP
+#define GPIO_PULL_DOWN GPIO_FLAG_PULL_DOWN
+
+DEFINE_DEVICETREE(esp32_gpio, struct Esp32GpioConfig)
+
+#ifdef __cplusplus
+}
+#endif

Platforms/platform-esp32/include/tactility/bindings/esp32_i2c.h

@@ -0,0 +1,15 @@
+// SPDX-License-Identifier: Apache-2.0
+#pragma once
+
+#include <tactility/bindings/bindings.h>
+#include <tactility/drivers/esp32_i2c.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+DEFINE_DEVICETREE(esp32_i2c, struct Esp32I2cConfig)
+
+#ifdef __cplusplus
+}
+#endif

Platforms/platform-esp32/include/tactility/bindings/esp32_i2s.h

@@ -0,0 +1,17 @@
+// SPDX-License-Identifier: Apache-2.0
+#pragma once
+
+#include <tactility/bindings/bindings.h>
+#include <tactility/drivers/esp32_i2s.h>
+#include <tactility/drivers/esp32_gpio.h>
+#include <driver/i2s_common.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+DEFINE_DEVICETREE(esp32_i2s, struct Esp32I2sConfig)
+
+#ifdef __cplusplus
+}
+#endif

Platforms/platform-esp32/include/tactility/bindings/esp32_spi.h

@@ -0,0 +1,15 @@
+// SPDX-License-Identifier: Apache-2.0
+#pragma once
+
+#include <tactility/bindings/bindings.h>
+#include <tactility/drivers/esp32_spi.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+DEFINE_DEVICETREE(esp32_spi, struct Esp32SpiConfig)
+
+#ifdef __cplusplus
+}
+#endif

Platforms/platform-esp32/include/tactility/bindings/esp32_uart.h

@@ -0,0 +1,16 @@
+// SPDX-License-Identifier: Apache-2.0
+#pragma once
+
+#include <tactility/bindings/bindings.h>
+#include <tactility/drivers/esp32_uart.h>
+#include <driver/uart.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+DEFINE_DEVICETREE(esp32_uart, struct Esp32UartConfig)
+
+#ifdef __cplusplus
+}
+#endif

Platforms/platform-esp32/include/tactility/drivers/esp32_gpio.h

@@ -0,0 +1,16 @@
+// SPDX-License-Identifier: Apache-2.0
+#pragma once
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include <stdint.h>
+
+struct Esp32GpioConfig {
+    uint8_t gpioCount;
+};
+
+#ifdef __cplusplus
+}
+#endif

Platforms/platform-esp32/include/tactility/drivers/esp32_i2c.h

@@ -0,0 +1,20 @@
+// SPDX-License-Identifier: Apache-2.0
+#pragma once
+
+#include <tactility/drivers/gpio.h>
+#include <hal/i2c_types.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+struct Esp32I2cConfig {
+    i2c_port_t port;
+    uint32_t clockFrequency;
+    struct GpioPinSpec pinSda;
+    struct GpioPinSpec pinScl;
+};
+
+#ifdef __cplusplus
+}
+#endif

Platforms/platform-esp32/include/tactility/drivers/esp32_i2s.h

@@ -0,0 +1,23 @@
+// SPDX-License-Identifier: Apache-2.0
+#pragma once
+
+#include <tactility/drivers/i2s_controller.h>
+#include <tactility/drivers/gpio.h>
+#include <driver/i2s_common.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+struct Esp32I2sConfig {
+    i2s_port_t port;
+    struct GpioPinSpec pin_bclk;
+    struct GpioPinSpec pin_ws;
+    struct GpioPinSpec pin_data_out;
+    struct GpioPinSpec pin_data_in;
+    struct GpioPinSpec pin_mclk;
+};
+
+#ifdef __cplusplus
+}
+#endif

Platforms/platform-esp32/include/tactility/drivers/esp32_spi.h

@@ -0,0 +1,30 @@
+// SPDX-License-Identifier: Apache-2.0
+#pragma once
+
+#include <driver/spi_common.h>
+#include <tactility/drivers/spi_controller.h>
+#include <tactility/drivers/gpio.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+struct Esp32SpiConfig {
+    spi_host_device_t host;
+    /** Clock pin */
+    struct GpioPinSpec pin_sclk;
+    /** Data 0 pin */
+    struct GpioPinSpec pin_mosi;
+    /** Data 1 pin */
+    struct GpioPinSpec pin_miso;
+    /** Data 2 pin */
+    struct GpioPinSpec pin_wp;
+    /** Data 3 pin */
+    struct GpioPinSpec pin_hd;
+    /** Data transfer size limit in bytes. 0 means the platform decides the limit. */
+    int max_transfer_size;
+};
+
+#ifdef __cplusplus
+}
+#endif

Platforms/platform-esp32/include/tactility/drivers/esp32_uart.h

@@ -0,0 +1,22 @@
+// SPDX-License-Identifier: Apache-2.0
+#pragma once
+
+#include <driver/uart.h>
+#include <tactility/drivers/uart_controller.h>
+#include <tactility/drivers/gpio.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+struct Esp32UartConfig {
+    uart_port_t port;
+    struct GpioPinSpec pin_tx;
+    struct GpioPinSpec pin_rx;
+    struct GpioPinSpec pin_cts;
+    struct GpioPinSpec pin_rts;
+};
+
+#ifdef __cplusplus
+}
+#endif

Platforms/platform-esp32/include/tactility/error_esp32.h

@@ -0,0 +1,8 @@
+#pragma once
+
+#include <esp_err.h>
+
+#include <tactility/error.h>
+
+/** Convert an esp_err_t to an error_t */
+error_t esp_err_to_error(esp_err_t error);