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

Buildscripts/properties.cmake

@@ -0,0 +1,23 @@
+function(GET_PROPERTY_VALUE PROPERTIES_CONTENT_VAR KEY_NAME RESULT_VAR)
+    # Search for the key and its value in the properties content
+    # Supports KEY=VALUE, KEY="VALUE", and optional spaces around =
+    # Use parentheses to capture the value
+    # We use ^ and $ with multiline if available, but string(REGEX) doesn't support them easily for lines.
+    # So we look for the key at the beginning of the string or after a newline.
+    if ("${${PROPERTIES_CONTENT_VAR}}" MATCHES "(^|\n)${KEY_NAME}[ \t]*=[ \t]*\"?([^\n\"]*)\"?")
+        set(${RESULT_VAR} "${CMAKE_MATCH_2}" PARENT_SCOPE)
+    else ()
+        message(FATAL_ERROR "Property '${KEY_NAME}' not found in the properties content.")
+    endif ()
+endfunction()
+
+function(GET_PROPERTY_FILE_CONTENT PROPERTY_FILE RESULT_VAR)
+    get_filename_component(PROPERTY_FILE_ABS ${PROPERTY_FILE} ABSOLUTE)
+    # Find the device identifier in the sdkconfig file
+    if (NOT EXISTS ${PROPERTY_FILE_ABS})
+        message(FATAL_ERROR "Property file not found: ${PROPERTY_FILE}\nMake sure you select a device by running \"python device.py [device-id]\"\n")
+    endif ()
+    file(READ ${PROPERTY_FILE_ABS} file_content)
+    set(${RESULT_VAR} "${file_content}" PARENT_SCOPE)
+endfunction()
+