Require Slot Support & Bug Fix!

• Adds support for commands which require inventory space (defined by buycraft.net).
• Fixes the multiple execution bug which was supposed to be fixed in the last release.

Fixes and Improvements.

• Fixes running /buycraft report in game
• Fixes commands sometimes run more than once (could still be around)

Fixed bad package

• Fixes the huge package size.

First release

• Implements all basic functionality.