HavenCore's DBC Custom Transformations

Adjusted the math on the HavenCore Stat Sheet and Custom Form Drain to properly reflect the new formulas in the Majin Update. This math adjustment also maintains it's compatibility with older DBC versions

Command "/havencore reset" made more efficient

Command "/havencore customform check" no longer defaults the target player to the person using the command at times. Properly warns when target player can't be found

Fixed Customform Creator GUI from breaking on player death. Whether you died inside or outside of the GUI, HavenCore will put it's data back when DBC removes it