New board: Elecrow CrowPanel Basic 2.8" (#225)

- Implemented Elecrow CrowPanel Basic 2.8"
- Change default "invert" setting for ILI934x driver from `true` to `false`
- Created `Xpt2046` driver subproject
- Refactored unPhone to use new `Xpt2046` driver subproject

Boards/ElecrowCrowpanelBasic28/Source/hal/CrowPanelTouch.cpp

@@ -0,0 +1,16 @@
+#include "CrowPanelTouch.h"
+#include "CrowPanelDisplayConstants.h"
+
+std::shared_ptr<Xpt2046Touch> createTouch() {
+    auto configuration = std::make_unique<Xpt2046Touch::Configuration>(
+        CROWPANEL_LCD_SPI_HOST,
+        GPIO_NUM_33,
+        240,
+        320,
+        false,
+        true,
+        false
+    );
+
+    return std::make_shared<Xpt2046Touch>(std::move(configuration));
+}