Finished ModuleLoader and ModPack module

ADDED: More security to InternalServer shutdown.
ADDED: ModuleLoader system with full functionality.
ADDED: Fully ModPack support.
ADDED: Modules tab in MainGui class.
CHANGED: Crypted configuration extension.
CHANGED: Modpacks URL.
CHANGED: Downloader class is abstract now.
FIXED: A bug with Profile deleter which blocked the GUI.
FIXED: A bug with Compressor internal module. Now, the compressed file
isn't renamed.