archives: avoid collapsing archive with single folder

We have historically used the m_bIsFolder after this as a flag,
to skip display of file. For example for rar 00X part files.

By not collopsing single folders, we can properly browse into
them again.
Properly handle cookies that specify a sub-domain
videolibrary: add choice to resume video when using "Play using..." (fixes #14358)
videodb: only re-draw progress bar when progress has changed in CleanDatabase()
platinum: lastPlaybackTime is in the "upnp" and not in the "dc" namespace
Merge pull request #4073 from Montellese/videodb_clean_speedup

videodb: speed up CleanDatabase()
Merge pull request #4063 from Montellese/play_using_resume

videolibrary: add choice to resume video when using "Play using..." (fixes #14358)
ffmpeg: correctly handle cookies that specify a sub-domain
VideoInfoScanner::GetFanart: fix: don't dereference null pointer
VideoThumbLoader::LoadItemLookup: don't try to load any art for "add" button
Merge pull request #4075 from Karlson2k/fix_add_cover

fix: FileItem::FindLocalArt: don't try to find fanart for "add" button
[info] don't ToLower() info conditions prior to resolving them - we need only compare them caseless in the info store
Merge pull request #4082 from jmarshallnz/case_sensitive_infobool

[info] don't ToLower() info conditions prior to resolving them
Merge pull request #4081 from voguemaster/master

ffmpeg: Correctly handle cookies that specify a sub-domain.
Merge pull request #4050 from elupus/archivefolder

archives: avoid collapsing archive with single folder