Merging changes from Indev for 1.7.0 release

- Completely reimplemented MC 1.7 networking, all functionalities from previous versions should be back & working
- Special thanks to dogwatch for fixing a critical VarInt issue that was blocking the development of the new 1.7 version
- Removed a leftover BouncyCastle reference in Visual Studio project file (thanks bearbear12345)
- MCC commands are now case insensitive (thanks bearbear12345)
- Automatically find a translation file from MC1.7+ "legacy" assets
- Some code cleanup here and there