Gravel ore entity no longer drops when broken

Stops people putting a torch under falling gravel ore to get it without
the proper tool
Tweaked required XP for tools once again
Override part builder mining level description
Add tooltips to tool parts
Stone tool parts removed from tinkers house chests

Doesn't apply if stone tools have been enabled in the config
Added "requires boost" tooltip to unboosted picks
Changed "Head XP" to "Boost XP"
Added valid materials tooltip to wood patterns
Fixed bug in wood pattern tooltip