fix (skip files) unsupported file options
fix tile size checks
refactoring: move directory handling functionality
add progress callback to limeview
file navigation working again
tagfiles: do everything with inarrays
sort before calling ls, avoids slow sort later on
reenable file selection from group
allow acces to tagfiles while scanning, immediate display in limeview after the first file is found!
better scanning, more responsive
(re?)fix loadtiff ... stupid rebase and stuff ... should be more careful with git
on-demand tag loading
add background thead to check xmp sidecars, update tag list in idler
enable tags filtering again
much faster tag list update (real update not clean and redo)
filterchain loading reimplemented
add callback to notify of changed filegroup (due to reading xmp, finding another file for group ...)
reimplement filters and filter chain saving
readd export, fix escaping for MT_STRINGS
Merge branch 'dirhandling'

conflict: sc/lib/filter_loadtiff.c cleaned