Added a way to store block groups as blueprints
Blocks can be added/removed from block groups, although it doesn't work well atm
Added some patches to the test class in an attempt to debug an unrelated issue
Added a command to test placing a block group
Added a SelectedBlueprint property to the Player class

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

And store delegates of dynamic methods invoking constructors
Tested with the automated tests

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