New board: Elecrow CrowPanel Avance 2.8" (#224)

- Added new board
- Extracted ST7789 driver and backlight PWM driver into separate subprojects
- Refactored T-Deck to use the shared driver modules
- Fix bug in WiFi service: searching for APs was broken

Boards/LilygoTdeck/Source/Init.cpp

@@ -1,4 +1,5 @@
-#include <driver/gpio.h>
+#include "PwmBacklight.h"
+
 #include <Tactility/TactilityCore.h>
 
 #define TAG "tdeck"
@@ -33,5 +34,10 @@ bool tdeckInit() {
         return false;
     }
 
+    if (!driver::pwmbacklight::init(GPIO_NUM_42)) {
+        TT_LOG_E(TAG, "Backlight init failed");
+        return false;
+    }
+
     return true;
 }