Ansirender improve + Mocha watch + Graphics Mode + ScrollRegion

- Ansirender output has been improved. 
- And Mocha has a watch command , make it easy to continuous run the tests
- Reïmplemented Graphics mode
- Scrollregion now passes the torture test

+ add (commented) failing test - see https://github.com/jedi4ever/terminal.js/commit/a46a50eabf4add7189e6e6c0e6da83004dc8a889