Implement LVGL with SDL for simulator (#16)

* Implemented LVGL with SDL for simulator

* cleanup

* added SDL to build

* build fix

* mutex fixes

* sim app cleanup and improvements

* docs updated

* fix for sdl?

* fix for SDL cmake setup

tactility-esp/src/hardware.h

@@ -0,0 +1,17 @@
+#pragma once
+
+#include "display.h"
+#include "touch.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+typedef struct {
+    DisplayDevice* display;
+    TouchDevice* _Nullable touch;
+} Hardware;
+
+#ifdef __cplusplus
+}
+#endif