Release 229 - Text object Atlas sprites and player heads

Text object Atlas sprites and player heads

Added support for the new text objects, atlas sprites, and player heads to the text editors. The commands that support it will now show an icons button on the text editor tool bar, which will open the text block manager. Currently it is quite basic, but the plan is to add visual previews and integrate it better into the text editors over the next few updates.

Also added was an index page of the various atlases and sprites. List of Atlas Sprites: https://www.gamergeeks.net/apps/minecraft/list-of-atlas-sprites

Also some minor patches to the mob generator thanks to feedback from the community.