Added party to Third Party Modpack Team

Changed Third Modpack Team to Third Party Modpack Team
Merge pull request #850 from lexware/patch-3

Added party to Third Party Modpack Team
ADDED: jcommander

 * Added command line parsing
 * Added options to change dynamic and cache directories
 * Added --help
 * Added WIP arguments
Merge pull request #853 from jikuja/jcommander

ADDED: jcommander
FIXED: CheckInstallPath regex check

 * CHANGED: CheckInstallPath: always print full error message string
   as debug message even if user has ignored warning/error