replace the local/automatic mid_level_tiles variable in matcher::match_world_tile with one that is created once during the setup phase (heap).
The dynamic part of the contained (16*16*3 = 768) vectors is being allocated on the heap in both cases - which made the repeated instatiations of the automatic variable so slow/expensive.
Also replace calls to vector<bool>.resize in nested loops with direct assignments to those vectors, which curiously even after a lot of profiling is the fastest way to reset the inorganic vectors - at least on Windows.
- embark-assistant.cpp: Replace 2 local/automatic mid_level_tiles variables with a single dynamic variable created during setup as well; add calls to matcher::setup() and matcher::shutdown()
- matcher.cpp/.h: add state with mid_level_tiles member; add setup and shutdown functions
- survey.cpp: add function reset_mlt_inorganics as replacement for the looped calls to vector::resize as all inorganic vectors are now expected to have the proper size when entering survey::survey_mid_level_tile
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