Palettes and custom scripts for buldings

Added the option to use custom scripts for the buildings, this will operate on each lot,
making it possible to write very simple scripts to get the look you want.

For those not too into maxscript, an example for making flat roofs could be:
(
GTExtrude 300
GTInset 40
GTExtrude -100
)

...and of course you can also use all maxscript commands.



Here's the preish-beta UI.

gtUI

 

Palettes can be manually set, loaded from an image, or sampled directly from
the viewport, creating a multi/submaterial with up to 100 materialID's.

Here the palette is taken from the texture of the background plane:

palette sampled from the viewport