Changes for v0.002
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Added data linking.
Shifted data: bw.rgb, tile.rgb, tree2.rgba
New data: s128.rgb, link, leftwall.mash, rightwall.mash,
    ceiling.mash, floor.mash, cube.mash
Added floating cube and tree.
Added paused uvar.
Console almost ready.
Split off console code into console.c, forest code into forest.c and
    input code into input.c .
Added mash loading code (new files mash.h and mashfmt.h),
    data/srcdata and removed tunneldat.h .
Added changelog and todo files.

