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_touch.h

@@ -0,0 +1,47 @@
+#pragma once
+
+#include "tt_hal_device.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+typedef void* TouchDriverHandle;
+/**
+ * Check if the touch driver interface is supported for this device.
+ * @param[in] touchDeviceId the identifier of the touch device
+ * @return true if the driver is supported.
+ */
+bool tt_hal_touch_driver_supported(DeviceId touchDeviceId);
+
+/**
+ * Allocate a driver object for the specified touchDeviceId.
+ * @warning check whether the driver is supported by calling tt_hal_touch_driver_supported() first
+ * @param[in] touchDeviceId the identifier of the touch device
+ * @return the driver handle
+ */
+TouchDriverHandle tt_hal_touch_driver_alloc(DeviceId touchDeviceId);
+
+/**
+ * Free the memory for the touch driver.
+ * @param[in] handle the touch driver handle
+ */
+void tt_hal_touch_driver_free(TouchDriverHandle handle);
+
+/**
+ * Get the coordinates for the currently touched points on the screen.
+ *
+ * @param[in] handle the touch driver handle
+ * @param[in] x array of X coordinates
+ * @param[in] y array of Y coordinates
+ * @param[in] strength array of strengths (with the minimum size of maxPointCount) or NULL
+ * @param[in] pointCount the number of points currently touched on the screen
+ * @param[in] maxPointCount the maximum number of points that can be touched at once
+ *
+ * @return true when touched and coordinates are available
+ */
+bool tt_hal_touch_driver_get_touched_points(TouchDriverHandle handle, uint16_t* x, uint16_t* y, uint16_t* strength, uint8_t* pointCount, uint8_t maxPointCount);
+
+#ifdef __cplusplus
+}
+#endif