[Open Assets] Steve v2.12

Changes:

• mc_keepinventory has been enabled by default, and its behavior in singleplayer has been changed to revert the hotbar to its state at the last touched checkpoint (which should make dying a lot less stressful)
• Added mc_backup and mc_restore commands for backing up and restoring hotbar contents
• Added mining/placing sounds, as well as alternately-pitched variants of the pain and item sounds
• Added ability to break bustable blocks
• Reduced item pickup timer

(Sorry for the minor version spam, this will probably be the last one for now)

Changes:

• The object type argument of the mc_give command is now case-insensitive and no longer requires "MT_" to be present at the beginning
• Fixed spriteless objects causing errors and erratic behavior when obtained using the mc_give command

Changes:

• Fixed Steve's items disappearing upon entering NiGHTS special stages

Changes:

• Fixed possibility of severe lag and/or lag spikes when looking at walls at certain angles
• Fixed object placement ghosts not being flipped with antigravity
• Fixed issue in Black Core Zone Act 3 where Steve is forced into the shuttle upon spawning
• Fixed Steve's height carrying over to NiGHTS special stages

Changes:

• Fixed Black Core Zone Act 2 being impossible to finish
• Fixed thrown items not being able to be picked up if they end up in water