Added some TODOs as well

- Fixed the crash on second time start
- Tweaked more stuff about the block

Breaking changes coming from FMOD 2.0:
- Audio[int index] changed to Audio[PARAMETER_ID index]
- Audio.Parameters removed

Removing blocks from groups when they are removed from the game
Attempted to update graphics when changing blocks
Disallowing changing the block group after creation, now that we can copy blocks

Fixed getting the selected blueprint
Fixed block groups not being assigned to first block

Fixed compilation and loading issues for 2020.10.27.17.13

Added Cluster.GetSimBodies() and SimBody.GetBlocks()
Fixed some issues with IDs and bad handling of them

Only works if the constructors are used

Fixed Assert.Equal()
Changed tests to reflect changes
Added Block property to the block event args
Completely removed sync things

Newly created blocks use the initializer to set properties, allowing the user to set per-block properties

Removed BlockIdentifiers.OWNED_BLOCKS as the original got replaced with an array
Added the correct group for each supported functional block
Removed EntityFactory property from IEntitySerializer as it is provided on deserialization

They are useful

Apparently they're processed, unlike in my save

Added center of mass
Removed delta velocities

Made GetBlockInfo() always return a reference without needing it as a parameter
Fixed Color property
Added CustomColor property for temporarily setting any color

Added API for adding more information on the debug display (not object-oriented yet)
Removed the setter for block type to ensure stability
Made the block API return defaults if the block no longer exists
Added property to check if the block exists
Made a struct for the block's color property
Added missing block IDs

Placement, movement, rotation, removal
Block looked at (in Player class), connected blocks