First try
Fixed some issues concerning scene entity creation.
Adapted main.
Merge branch 'master' of github.com:chaot4/sea-crossing into dev

Conflicts:
	src/main.cpp
Finished inserting marker positions, added scrolling function and activated MSAA.
Removed template from SimpleGUIGame. Added GUI output for DebugGame.

We can no place markers on the GUI field using the console!
Initialized the map for the gems of the MessageReceiver.

Thus, we can now see the placed gems! :)
Fixed a wrongly rotated marker.
Merge branch 'dev' of github.com:chaot4/sea-crossing
Fixed useless endline outputs of SimpleGUIGame.