Added CustomModpack API object to the rest API

Signed-off-by: Dalton Pelc <daltonjpelc@gmail.com>
Updated license information and pom.xml
And I missed a file, whoops
Fixes bug that cleared pack directories
Quick fix for natives being in launch directory
Locks login button while updating/launching
Removed update check code for now
Moved targetdirectory property to where it was called before
Fixed mod loading for pre-1.3.2 FML