following promotion of DRTVWR-514

Add some logging for QA purposes (based on INFO/Mesh tag) to display when the mesh header and the mesh body is retrieved from the simulator or the local cache.

Fix for SL-14985 - bump the texture cache version so the texture cache is purged on startup after running an older version of the Viewer

Ansariel kindly offered their patch to help mitigate this round of file system issues - taken from https://vcs.firestormviewer.org/phoenix-firestorm/changeset/104a8600946be01e2de44d10ad069ba854272d1f

This set of changes reverts the merge with master (git revert c83e740e) and results in a version of the DRTVWR-519 that matches what was presemt before it was deployed as a release viewer *plus* 3 small fixes from Maxim (See commits).  This branch can now be used for additional fixes before eventually being used to release D-519 as normal

following promotion of DRTVWR-532

This reverts commit e61f485a, reversing
changes made to 00c47d07.

following promotion of DRTVWR-519

following promotion of DRTVWR-517

# Conflicts:
#	indra/llui/llscrolllistctrl.cpp

following promotion of DRTVWR-513

Remapped debugging avatar textures (requires godlike agent) to Ctrl+Shift+Alt+K

SL-14505 FIXED [Win10] The viewer isn't started on the non-English system locale

Approved-by: Callum Linden

This reverts commit afd734b5. Fix will be updated and moved to DRTVWR-515.