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

TactilityC/Include/tt_hal.h

@@ -7,14 +7,26 @@ extern "C" {
 /** Affects LVGL widget style */
 typedef enum {
     /** Ideal for very small non-touch screen devices (e.g. Waveshare S3 LCD 1.3") */
-    UiScaleSmallest,
+    UiDensityCompact,
     /** Nothing was changed in the LVGL UI/UX */
-    UiScaleDefault
+    UiDensityDefault
+} UiDensity;
+
+/** @deprecated use UiDensity */
+typedef enum {
+    UiScaleSmallest, // UiDensityCompact
+    UiScaleDefault // UiDensityDefault
 } UiScale;
 
-/** @return the UI scaling setting for this device. */
+/**
+ * @deprecated Use UiDensity
+ * @return the UI scaling setting for this device.
+ */
 UiScale tt_hal_configuration_get_ui_scale();
 
+/** @return the UI scaling setting for this device. */
+UiDensity tt_hal_configuration_get_ui_density();
+
 #ifdef __cplusplus
 }
 #endif