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/Source/tt_lvgl.cpp

@@ -0,0 +1,17 @@
+#include <Tactility/lvgl/Lvgl.h>
+
+extern "C" {
+
+bool tt_lvgl_is_started() {
+    return tt::lvgl::isStarted();
+}
+
+void tt_lvgl_start() {
+    tt::lvgl::start();
+}
+
+void tt_lvgl_stop() {
+    tt::lvgl::stop();
+}
+
+}