Added robots

[Abwasserrohr]

Added new feature called "robots".
These robots can be given by a command and give the player a robot which can have different designs and jobs.
Currently, there are two jobs which doesn't do anything different. For starting, they can mine almost any block as miner or treecutter. More are gong to be added in the future, if there are any ideas open for new jobs.

• Option to change all relevant things
• Fallback translation in Englisch as options
• Default configuration
• Menus for robot, robot designs and robot jobs
• Make robot designs and jobs changeable while they're running
• Animation while robot is on
• Save robot stats and data in NBT
• Create functions to save and load data from NBT
• Handle breaking of the robots to give a item which holds the custom NBT data
• Prevent damage from lava or fire for the robot
• Set the facing direction of the robot depending on the direction the player has looked at placing
• Spawning animation
• Add language variable support
• Add translations to language files
• Make robots renameable
• Limit the size of the renameable with a option
• Handle placing of robot items with already existing robot NBT data
• Handle chunk unloads and server stop
• Add comments to make it easier to understand for others
• Add robot removal on island deletation
• Tested
• Working without errors
• Prevent placement on other islands (seems to be possible)

Close #103, once this is done.

[Abwasserrohr]

Functional and ready to merge.
This is the first version. Jobs have to be added later.