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

Devices/heltec-wifi-lora-32-v3/device.properties

@@ -5,6 +5,7 @@ incubating=true
 
 [apps]
 launcherAppId=Launcher
+autoStartAppId=ApWebServer
 
 [hardware]
 target=ESP32S3
@@ -24,3 +25,4 @@ infoMessage=Due to the small size of the screen, the icons don't render properly
 [lvgl]
 theme=Mono
 colorDepth=16
+uiScale=70