Removed old utility color texture

core/src/cz/nic/tablexia/TablexiaApplication.java

core/src/cz/nic/tablexia/debug/DebugInfo.java

core/src/cz/nic/tablexia/game/AbstractTablexiaGame.java

core/src/cz/nic/tablexia/graphics/ColorTexture.java

core/src/cz/nic/tablexia/loader/TablexiaAtlasManager.java

core/src/cz/nic/tablexia/menu/MainMenu.java

core/src/cz/nic/tablexia/menu/MainMenuDimmer.java

core/src/cz/nic/tablexia/screen/AbstractTablexiaScreen.java

...cz/nic/tablexia/screen/preferences/PreferencesScreen.java

core/src/cz/nic/tablexia/util/ui/dialog/TablexiaDialog.java