Change-rollback working

Days of debugging finally paid of. This release adds full rollback functionality for changes that happened during prediction when input arrives from the past. (Lesson learned: if components were added, they have to be removed when rolling back. Sounds trivial, I know!). The debugging left a little mess behind, so the next updates will be refactorings/cleanup.

Another good thing: A new feature for debugging was added. It is possible to dump the whole gamestate. A full dump consists of a few smaller dumps:

• All active game-entities
• All input-entities
• A serialized log that lets you replicate a whole game with input simulation as it was ingame, see the dump-tests for an example.