Merge UI into Development

See merge request !4

# Conflicts:
#   src/main/java/de/hdm_stuttgart/battlearena/Main/Main.java

update: exports in module-info.java, fix: collisions with map not detected, fix: missing methods in IEntity.java #34

update: added test map in GameSceneController.java, add: textures, update: variables in TileManager.java #41 #39

merging player for integration testing

See merge request !3