Add the ability to render MystCraft ages

Adds the ability to view [MystCraft](http://www.minecraftforum.net/topic/918541-151-mystcraft-0102/) ages in MCMap-Live.  This depends upon a related [pull request to mcmap](https://github.com/Zahl/mcmap/pull/27).  A compiled binary of the updated mcmap is included in this pull request.

This change adds a "MystCraft Ages" submenu to the Options menu which displays the current set of MystCraft ages.  This list is determined by inspecting the world folder for the distinctive "DIM_MYST" subfolders and dynamically creating a menu item for each.  Selecting and unselecting these menu items works just like the existing Nether and End options.  If there are no MystCraft ages, then the submenu is disabled.