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

Drivers/PwmBacklight/Source/PwmBacklight.h

@@ -0,0 +1,11 @@
+#pragma once
+
+#include <driver/gpio.h>
+
+namespace driver::pwmbacklight {
+
+bool init(gpio_num_t pin);
+
+void setBacklightDuty(uint8_t duty);
+
+}