Fixing bugs probably

The last grid generation and missing textures bugs should now be squelched. Let me know if that's not the case.

Color pick can now be done with the middle mouse button (in addition to alt+click) plus I made a lil' effect for it.

I updated Unity to what is supposed to be a more stable version, hoping it might solve some launch bugs that seem to exist at the engine level.

I think I fixed the broken alpha bug that made the fences look solid on some Macs.