Bootstrap auto updater

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We should get rid of the manual process of installing and updating the GameModifications into Bootstrap.

Needed:

• [x] the client should be able to tell if a new GameModifications version is available

• [x] the client should be able to automatically replace the old GameModifications with the new one

• [x] the client should be able to check if a world still has an old version of the GameModifications

• [x] the client should then warn the player and instruct him on how to update the world (Reinjection via Agent)

• [x] Use Serverside Cached GH API Endpoint

• [x] Modify "Game Modifications" to feature a Version Number.

Bonus Points: - [ ] the client automatically detects the correct Bootstrap Directory

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Linked to #38

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The current Implementation is hitting github servers to check for an Update, I want to implement a "proxy" feature, that caches the Information on the Gameserver, this way the Client wont have to mess with this configuration. and the Github servers are not accessed more frequently then necessary.

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A server side, cached API Endpoint for the Latest Github release, of Game Modification and Client, has been added. and is now used per default. #38