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/Source/tt_hal.cpp

@@ -5,9 +5,14 @@
 
 extern "C" {
 
+UiDensity tt_hal_configuration_get_ui_density() {
+    auto density = tt::hal::getConfiguration()->uiDensity;
+    return static_cast<UiDensity>(density);
+}
+
 UiScale tt_hal_configuration_get_ui_scale() {
-    auto scale = tt::hal::getConfiguration()->uiScale;
-    return static_cast<UiScale>(scale);
+    auto density = tt::hal::getConfiguration()->uiDensity;
+    return static_cast<UiScale>(density);
 }
 
 }