Memory issues

[Tiago-Ling]

Currently the tilemap is using too much memory: a big map (e.g. 1000 x 1000 tiles or bigger) must create one 2D array of its size to each layer. This takes up a lot of memory which prevents usability for maps of this size. In my work computer a 1200x1200 map crashes the application (i suppose there's a memory use threshold ~1GB)

One possible way is to research more about sparse array optimization and compression: http://www.cs.nthu.edu.tw/~ychung/journal/ekmr_compression.pdf

The idea of this issue is to discuss smarter ways of storing map data during runtime.