PARTIAL FIX EXT-3491: only bring up "external browser"notification if target is external or pref is set
Review #86
This changes the logic to bring up the notification "Do you want to open your Web browser to view this content?" only if either the target is _external, or the user pref says to. Otherwise it avoids the notification.

This is actually two seperate issues:

1) After disabling parcel media from the nearby media floater, it can't be re-enabled
2) When you disable parcel media from the nearby media floater, faces displaying it don't revert to their original texture

This change fixes issue (1), by forcing the priority of the inworld media instance to normal in LLViewerMedia::updateMedia() so it will always get reloaded instead of possibly being kept unloaded due to already-loaded prim media.

Issue (2) is still under investigation.  In addition to the case where you disable parcel media from the nearby media floater, it also doesn't restore the textures when you leave the parcel, and I think I've even seen it when unloading

Convert top firing asserts into big warnings.
To be reviewed by Mani.

FIX EXT-2871 : Use "original texture" id in panelface if the current selected texture is a media texture

Review #84 (Richard and Callum)

Fixed major bug EXT-4130 ([BSI] "Only friends and groups can call or IM me" needs better label OR is buggy).
Viewer now handles incoming inventory offers disregarding the setting.

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Turns out the UI controls weren't hooked up to anything and so not showing that the parcel was actually voice enabled.

Fixed by restoring the same functionality for these controls as in previous viewers, i.e. they now reflect the state of the current parcel, but are disabled when voice is disabled on the region.

Reviewed by Lynx.

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- Fixed buttons location in people, profile, picks, notes panels to enable handling clicks on the whole button surface.

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Landmarks panel after closing Create Landmark panel
- Added selecting landmark in landmarks panel after it was added or edited.
- Added expanding accordion tab containing the selected landmark.

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fix for normal EXT-4035 Old sidepanel tab's text remains highlighted when switching to inventory sidepanel tab

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Removed changes made in changeset 7982:97391caf89c3 (fixes EXT-4465(UI issue with scroll-bar in Voice Control panel)).
It is not needed anymore because auto resizing was removed.

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Also encreased floater minimum height to show one participant(this fixes ghost scrollbar)

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fix normal EXT-4494 [BSI] Group Chat and Group Call buttons are shown even when you are not in the group

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move disconnect rendering into render_ui
code reviewed by davep