Add macOS simulator build to pipelines (#162)

- GitHub actions changed to build simulator on macOS (it's broken, but at least we get a good code portability check for now!)
- `Buildscripts/` shell scripts updated to use `/bin/sh` so it works on macOS too
- Various includes fixed in various subprojects so the code is more portable

Tactility/Source/lvgl/LvglDisplay.cpp

@@ -0,0 +1,14 @@
+#include "lvgl/LvglDisplay.h"
+#include "Check.h"
+
+namespace tt::lvgl {
+
+hal::Display* getDisplay() {
+    auto* lvgl_display = lv_display_get_default();
+    tt_assert(lvgl_display != nullptr);
+    auto* hal_display = (tt::hal::Display*)lv_display_get_user_data(lvgl_display);
+    tt_assert(hal_display != nullptr);
+    return hal_display;
+}
+
+}