Project restructuring (fixes macOS builds) (#198)

- Create `Include/` folder for all main projects
- Fix some issues here and there (found while moving things)
- All includes are now in `Tactility/` subfolder and must be included with that prefix. This fixes issues with clashing POSIX headers (e.g. `<semaphore.h>` versus Tactility's `Semaphore.h`)

.github/actions/build-simulator/action.yml

@@ -23,6 +23,7 @@ runs:
       shell: bash
       # See Libraries/SDL/docs/README-linux.md
       run: >
+        sudo apt-get update && 
         sudo apt-get install build-essential git make
         pkg-config cmake ninja-build gnome-desktop-testing libasound2-dev libpulse-dev
         libaudio-dev libjack-dev libsndio-dev libx11-dev libxext-dev