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/Lvgl.cpp

@@ -1,14 +0,0 @@
-#include "lvgl/Lvgl.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;
-}
-
-}