Spring RTS Engine

Thanks to Jip from the FAF community, I repurposed one if his maps for Spring.

16x16, 12 player map, with all the bells and whistles and sauce included!

https://springfiles.com/?type=2&filter= ... bc3bc36c36

Map looks very nice, and should also play nice, Thanks!

issues :
- uneven metal amounts: a lot of spots are off by about ~5% compared to their symmetrical counterpart
- one of the south-eastern start positions is wrongly set to northeast

It's 2021... why aren't mex spots all lua by now?