Moved code that calculates visible tiles from DrawMap to Iso canvas
so the portion of the main map array is now copyed to a new array and passed
to the drawing method instead of being handled on the fly by limiting the
loops in the drawing algorithm.
also added a method that can flip the map array.
Merge branch 'master' of https://github.com/Sy4z/The-Excellent-Adventure

Conflicts:
	src/dataStorage/Data.java
	src/gameRender/IsoCanvas.java
Merge branch 'master' of https://github.com/Sy4z/The-Excellent-Adventure

Changed some parameters of placeholder map, caused a conflict