add a name database

[RunningDroid]

I may add a database that stores a hash of the .modpak and the name from the .modinfo inside the modpak. The problems would be:

• unpacking the modpak (I could probably try to detect the current platform and use the appropriate asset_unpacker)
• where to put the database (in the starbound dir should work)
• which hashing algorithm to use (probably md5)
• how to use it
• what format the database should be in (probably just a Lua table type thing)