First images to be committed for the minig game

These are mainly placeholders until someone more talented comes along.
Blocks fall the wrong way, but still looking good.
still buggy but closer.
Rocks now slide at the proper speed

I just need to fix refill speed
Delays are getting closer.
changed from ij to xy to make reading easier.
minor refactoring for clarity
refill working properly, refactoring

- removed unwanted tile spacing
- renamed GEM_SIZE to TILE_SIZE
- removed OTHER sprites (for now)
- refactored create() to use a move_gem() function
- removed an unneeded param on checkandkillmatchedgems
- lots of comments
- renamed durationMultiplier to distanceMultiplier
- refill board now works properly
refactoring, new stone type, faster delay

A lot of refactoring to compare it to the original version of the script to spot the bug with failed swaps.
sped up duration from 500 to 200 ms
changed board size for testing purposes
added test drop rates, although they aren't used currently
added common and uncommon test items
more renaming of GEM to Tile
moved moveTile() to below the main testing section (like the original)
added getRandRangeNum()
Merge pull request #140 from MultiverseMiner/mininggame

Mininggame