Dirty regions detection (blocks of RAM that are been overwrite)

[Zardoz89]

Implement dirty regions, blocks of RAM that are been overwrite.
Probably using std::map<Range, bool>. Useful to optimize when is necessary to update screen texture/send TDAScreen across network, and it would necessary for DJIT CPU core.

Trello card : https://trello.com/c/XmMoXWOh

[Zardoz89]

Notes :

• http://en.wikipedia.org/wiki/Interval_tree
• http://stackoverflow.com/questions/28700095/jit-emulation-and-tracking-dirty-memory-blocks

Also, I'm thinking in a less fined grained solution that uses a map . This map, maps address to a list (or other type of container) of address ranges on buckets of 256 bytes, were each address range limited to 256 byte boundary or have a self reference to how many buckets are mapped. This idea would need more develop and tweak/profile the size of bucket, and other details