Though the major benefit is only for blocks right now (using initializers)

Added support for getting the player's current building mode (build, color, config, blueprint)
Added support for getting the current game's mode (building, playing, prefab etc.)

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

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