Add brushing indicator

[capsey]

While brushing, show how well player is doing by changing the XP bar to a bar of how good they are moving the camera:

• Completely filled bar is red, indicating that player is not moving the camera enough and block is going to break
• Half filled bar is orange indicating that player is close to not breaking the block
• Not filled bar is green indicating that player is making progress

[capsey]

Also make so that player only makes progress towards uncovering the loot when they are not actively breaking the block, which makes sense.

[capsey]

Maybe also remove block repairing mechanic since it doesn't make much sense...