Started to work on refactoring single rendering components:
- TileRenderer is responsible of tile_size
- Removed block/tile_size from RenderViews again
- Management code will need some changes to predetermine the tile size
of a map
s/getBlockImageSize/getBlockSize/
Added virtual keyword to all virtual methods in derived classes.

grep -hIRo "virtual .*$" src | sed 's/virtual //' | sed 's/ = 0//' | sed
's/ {//' | sed 's/;//' | sort | uniq > virtual
cat virtual | xargs -l1 -i grep "^\s*{}" -R src