UI:
misc: restore default window positions when positions get out of range
misc: increase display time of tooltips
misc: slightly regrouped ui elements
added: scanner, context menu option to restore old scan results on startup and selection

Core:
misc: updated spdlog to 1.15.0
misc: updated to 7zip 24.09
misc: don't reload xml and build up structures when they are already in memory and need no refresh
misc: align and share rebuilder/scanner common routines
added: scanner, samples, supporting flac
fixed: scanner, typo in wine script
fixed: scanner, internal sha1 check for files with identical crc32 but different sha1 values isn't run
fixed: scanner, samples, wrong named files (case check only) aren't fixed
fixed: scanner, samples, wrong named files (case check only) also appear as unneeded
fixed: scanner, samples, decompressed files are marked as unneeded
fixed: scanner, samples, machines which reference themselves via sampleOf are marked as unneeded in full mode
fixed: scanner, confusing 'can't remove/backup' messages in case of circular renames between different sets
fixed: scanner, confusing 'can't remove/backup' messages in case a wrong file with a right name is replaced with a fill in