more windows bug workarounds and real smoothing bug
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windows needs it extra-hard
- optimise mapcache tile loading quite a bit to avoid loading the same tile again and again. - only request mapcache tiles serially, to avoid starving foreground requests.
- changed most db accesses to be asynchronous (this was way more difficult than anticipated) - face id allocation is still synchronous (and has to be as long as we want to allow multiple instances running in parallel) - facemap is cached locally, so subsequent accesses are fast - the alternative would be to store faceids, not tileids, in the in-memory map, but then mapcache tiles are non-displayable unless the server already sent them. - tile loading and map cache load/store are fully asynchronous - replaced 32x32 dialogue and noface images by 64 bit versions - properly scale special dialogue/noface textures to tilesize
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