Due to udp texture fetching no longer being present

following promotion of DRTVWR-575

Fix SL-18511 TOS and MFA login failure handlers must cooperate to answer both reasons at the same time

following promotion of DRTVWR-574

following promotion of DRTVWR-548

Since the performance overhaul project, there should be essentially no difference between rigged meshes and non-rigged as far as vertex buffer management is concerned.

Should fix some common crashes for parcel media

Water texture should load only after having caps.
Prefetch textures should load only after having caps.
Prefetch list is now per grid

SL-18068: Update to viewer-manager build 575083

Approved-by: Andrey Kleshchev
Approved-by: Brad Kittenbrink

It might be safe to merge mSeedCapAttempts with mHttpResponderID, but for now leaving them separated, if only for making this mechanic clearer.

# Conflicts:
#	indra/newview/llmodelpreview.h

following promotion of DRTVWR-544

SL-18151 [SEC] MOAP can force multiple floaters open on users screen: The Viewer part of the fix for this JIRA - pulls in the updated Dullahan that exposes the user_gesture/is_redirect flags and uses them to determine what type of 'nav_type' is exchanged with viewer/plugin