properly wrap XMPP stuff with "#ifdef HAVE_XMPP"
maintenance: replace implicit casts with explicit
Don't use the scale to determine the depth in Faceplus.  Apparently it's not
reliable.
Update attachment data on attachment delete.
Better attachment styling.
use START_LOCATION as default settings
Force the scroll bar.
Scratch that; I just didn't understand how magic invisible disappearing scroll
bars worked on OS X.
fix copy-n-paste typo
gravity disabled by default
Fix for attachments' not appearing in rear view mirror head mode.
Un-default the "OK" button so that we can press enter on the URL field.
Attachment translations in world space.
Only add each texture once.
Merge pull request #2797 from ey6es/master

Disabled depth determination based on scale for Faceplus, improved attachment edit UI, fix for attachments' not appearing in rear view mirror head mode.
disable environment gravity when not set in menu
Fix for exports from Sketchup.
Merge pull request #2802 from ey6es/master

Fix for exports from Sketchup.
Update welcome screen
Merge remote-tracking branch 'upstream/master' into 19640