Added brackets for zoom

[ is zoom in
] is zoom out
(cherry picked from commit a33f12d90d116535b78f540f40dedc7545159f93)
removed duplicate color

MEDNIGHT_BLUE => MIDNIGHT_BLUE
Separation and improvement of digging and razing invaders #106

- changes dfhack.init to allow for digging and razing invaders to be
enabled separately

- added the capability to dig/raze to more creatures

- doubled the time it takes invaders to destroy smooth constructions (if
they can). this way building from blocks/bars gives you an advantage
over simply using boulders.

- just tweaks the delay slightly so the GUI works properly. it's
searching and replacing destroySmoothConstruction 1 with -1, so 100 will
also be toggled, which we don't want. so we're going to hack around it
by using 99 instead

This still needs some heavy testing, especially on the cost/delay
values.

Conflicts:
	Dwarf Fortress/dfhack.init
Merge branch 'gold' into beta

* gold:
  Separation and improvement of digging and razing invaders #106
  removed duplicate color
  Added brackets for zoom