Updated tool model and color schememe and a few minor things

Can adjust how fast it is shooting particles (ie how many particles per update)

Sounds

Removed the status system as it did not actually do anything and it increased complexity. (mainly didn't work due to potentially corroding on contact)

Can switch off corrosion of medium and hard materials

Quick fix for the prior update

Added an options menu (m in game)

Optimisation

small change to physics: should be more consistent with the amount sticking into a target
(maybe sticking less to surfaces)

-fixed issue with not really corroding things well from the side or at all from the bottom (eg a roof)
-Bug fix for "still corroding after despawning" (not tested)
-small optimisation
-should also corrode hard materials now not just soft and medium (not actually tested)
-also randomised the speed of corrosiion per particle
-randomised particle size (visual only)

-The particle physics had to be changed a lot for the above so the speed of corroding may have changed. Attempted adjust it not to change a lot.

Switched to using Particles instead of voxel bodies. This means now it is global and has a different feel to it.

Still the physics is not very optimised yet.