cp
Revert "cp"

This reverts commit 952c253d3c7e82d1856397d3a1a4b7f1f139ba6e.
Rename GameEngine to SharkEngine in heading comments.
Rename include guards: GAMEENGINE_ -> SHARKENGINE_
Renamed directory structures, and game_engine.* to match SharkEngine name.
Updated #includes for gameengine->sharkengine directory name change.
Fixed include paths for gameengine -> sharkengine. Implemented missing GameSize <-> GamePoint conversion functions.
Removing obsolete test code.
Renamed GameEngine -> SharkEngine.
Renamed game_engine -> shark_engine.