Brighter scenes (game's own exposure), less VRAM

Back up user\save, or build over the same folder with the same .nup: it skips re-reading the game. Includes everything from pointer-lighting-2.

• Brighter, as the game intends (#103): an old workaround darkened every scene to 65% of the game's own exposure. It was there for the washed-out look that the lighting fix solved, and now it only made things too dark. Kakariko is sunlit again.
• Less VRAM (#105, #106): the texture cache now uses at most 6 GB. On 16 GB cards it used to fill most of the card, which looked like a leak.
• AMD testing switch: if you get a black screen on AMD, start the game with the environment variable RX_VK_NO_FOLLOW=1 set and tell me whether the picture comes back. This turns off the newest lighting change.