Fewer crashes on 4-6 GB laptops, 100% resolution fix, builder fixes

Back up user\save, or build over the same folder with the same .nup: it skips re-reading the game (a rebuild over the same folder took under 6 minutes here). Includes everything from amd-shared-memory.

• Laptops with 4-6 GB of VRAM (#96, #132): the renderer keeps fewer GPU-side copies of game memory on cards with 8 GB or less, and none when VRAM is nearly full. Before, it could run past what the card allows and the GPU timed out (black screen or "device lost").
• Resolution 100% set before starting no longer gives black 3D (thanks to vzeol, PR #102).
• Builder:
  • a different .nup now replaces both the old game files and code, instead of mixing old assets with new modules (thanks to monsterlag, PR #129);
  • game file paths can't escape the output folder (PR #128);
  • builds from a source checkout without the hot profile work (thanks to klimovich008, PR #74).

Still being worked on: missing leaves and grass (the game's foliage culling now produces draw counts, the leaves don't show yet), AMD black screens (please test amd-shared-memory or this one and report), GTX 10xx noise.