Updated dist.tcl
Updated Blends.txt and Rules.txt
Added TMX To BMP.

This takes pixels out of TMX files and puts them into main/veg images.
If only some cells are selected, it will replace parts of existing images.
BMPToTMX has 2 modes, create/replace or update.
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The compress-tile-layers and copy-pixel options are gone, meaning there is
no choice whether to put tiles or pixels in generated TMX files, it is always
pixels.
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There are two new exclusive options, 'update' or 'replace' to indicate whether
new TMX files are created or if we are simply updating the BMP pixels in maps,
leaving all other parts of the TMX untouched.
Simplified TMXToBMP to use the world's BMP images instead of specifying them.