Merge develop into main (#303)

- `DisplayDevice` improvements related `DisplayDriver`
- Replaced incorrect usage of `spiBusHandle` with `spiHostDevice` in all SPI display devices
- Disabled `DisplayDriver` support for RGB displays for now
- Updated `GraphicsDemo` project for the above changes
- TactilityC improvements:
  - created `tt_hal_device_find()`
  - created `tt_hal_display_*`
  - created `tt_hal_touch_*`
  - created `tt_lvgl_*`
  - export `tt_app_*` calls

TactilityC/Include/tt_hal_device.h

@@ -0,0 +1,33 @@
+#pragma once
+
+#include <stdint.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+enum DeviceType {
+    DEVICE_TYPE_I2C,
+    DEVICE_TYPE_DISPLAY,
+    DEVICE_TYPE_TOUCH,
+    DEVICE_TYPE_SDCARD,
+    DEVICE_TYPE_KEYBOARD,
+    DEVICE_TYPE_POWER,
+    DEVICE_TYPE_GPS
+};
+
+typedef uint32_t DeviceId;
+
+/**
+ * Find one or more devices of a certain type.
+ * @param[in] type the type to look for
+ * @param[inout] deviceIds the output ids, which should fit at least maxCount amount of devices
+ * @param[out] count the resulting number of device ids that were returned
+ * @param[in] maxCount the maximum number of items that the "deviceIds" output can contain (minimum value is 1)
+ * @return true if one or more devices were found
+ */
+bool tt_hal_device_find(DeviceType type, DeviceId* deviceIds, uint16_t* count, uint16_t maxCount);
+
+#ifdef __cplusplus
+}
+#endif