Update GAME_BALANCE.txt

As part of the critter-consolidation, updating per #6346.
If an ammo type has a special explosion effect, just trigger it when it ignites in a fire.
sinkHOLE

This makes sinkholes leave holes (as in, fall down a level) after you
trigger them.  Still doesn't do anything if critters hit 'em, but it
makes a bit more sense than leaving a pit in the square you escaped to
and the sinkhole remaining unsunk.
Prevent a vector underrun in inventory display.
Added check to prevent player from being able to push furniture into cars. Issue 6337
Merge remote-tracking branch 'origin/master'
Merge branch 'fix-inventory-slice-underrun' of https://github.com/kevingranade/Cataclysm-DDA into kevingranade-fix-inventory-slice-underrun
Merge remote-tracking branch 'origin/master'
Merge branch '6337FurnAndVehGrab' of https://github.com/frycarson/Cataclysm-DDA into frycarson-6337FurnAndVehGrab
Merge remote-tracking branch 'origin/master'
Merge pull request #6347 from KA101/sinkhole-fix

Sinkhole fix
Merge pull request #6332 from KA101/Re-Balance

Update GAME_BALANCE.txt
Merge remote-tracking branch 'origin/master'