Remove duplicate code.
Temperature IOP: gui_update: cmp against camwb using memcmp
Temperature IOP: refactor DT_IOP_NUM_OF_STD_TEMP_PRESETS
Temperature IOP: Match stored WB multipliers against all camera WB presets and select matched preset. Fixes #8303
Temperature IOP: apply_preset(): fix typo
Temperature IOP: apply_preset(): no need to recompute makermodel/model each time
Might be a bit faster.
Temperature IOP: apply_preset(): do not look through ALL presets, only through different tuning values of that base preset
Temperature IOP: implement interpolation between camera WB presets finetunings
NOTE: for interpolated data #8303 still is an "open" issue

If we fail to find enough good data, hysteresis happens (it stays on previously used values)

Inspired by Denoiseprofile IOP dt_noiseprofile_interpolate() and it's usage
Temperature IOP: Match stored WB multipliers against interpolated camera WB presets and select matched preset. Refs #8303
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mipmap cache: safety margin around full buffers. avoids deadlocks for me.
Merge remote-tracking branch 'origin/pr/781'