Mech drill rework

[XElectricX]

About The Pull Request

Summary of changes:

• Time to drill scales with hardness of drill head material: steel 1.7, plasteel 1.1, diamond 0.5 seconds
• Added mining by bumping into rocks (or fixed, but I suspect it never worked)
• If you drill an object or a wall, the drill automatically continues drilling until it is destroyed (super funny, try it out)
• General fixes and improvements to this ancient code

Why It's Good For The Game

Funny drill go brrr and better code.

Testing

Drill works as normal. Can mine, dig up sand, drill my through the entire ship, and the timers work accordingly.

Changelog

:cl: balance: Mech drill speed scales off material hardness; minor speed adjustments. fix: Mech drills were not able to mine by bumping into walls. code: Mech drill code is more organized. refactor: General mech drill improvements. /:cl:

[Holvr0]

I'm naturally in favour of - as you put it - better code, but why the change from 3 tiles to 1? The whole point of mech drill was that it can grind down whole swaths of terrain at once, as opposed to just 1 tile at a time like a handheld drill. Even if 1 is being dug out faster than 3, it's still not a good change.

At most, it could be a toggleable drilling mode - drill really fast and narrow, or slower and broad - but not a permanent removal of the latter.