EXT-7920 FIXED Start and stop buttons are not clickable

Start and stop buttons were outside the UI box containing them.

See subtasks for complete lists of fixes.  The preview gesture floater had some major issues and regressions.

Superficial header file fixes.

EXT-7888 FIXED Opening a gesture from an in-world object shows gesture floater with blank information
EXT-7909 FIXED Cleanup llpreviewgesture #include files

Fixed an issue that was causing gesture asset loading to fail.
Also did header file cleanup.

The SLE code makes any http://<host>/app, http://<host>/region,
or http://<host>/secondlife URL be treated as a SLurl rather than a
normal http URL. This seems to be overly general, and has bitten us
because http://secondlife.com/app is used as a redirect URL for server
release notes.

In the short-term, I've made an exception for hostnames that match
"secondlife.com", so that the server release notes work again.

In the long-term, we should assess whether treating any URL that starts
with a path of "app", "region", or "secondlife" should be treated as a
SLurl. What happens when google adds "http://www.google.com/app"?

We now point directly to the wiki for Viewer release notes and we
include three digits in the version number. E.g.,

http://wiki.secondlife.com/wiki/Release_Notes/Second Life Beta Viewer/2.1.0

reviewed by Mike Antipov, Loren Shih at https://codereview.productengine.com/secondlife/r/599/

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Removed "open" menu option, to be consistent with right-click options on inventory folders elsewhere.

"Open" is added conditionally based on item type.

EXT-6571 FIX - avoid removing links to missing wearables, which fixes a problem with ordering in multi-wearables

Fixed highlight and open item code to work for both categories and items (was previously only working for items).

reviewed by richard

reviewed by Richard

EXT-7823 FIXED Accordion widget was improved to show different message when no_matched_tabs  in panel or no_visible_tabs in panel.

Added "no_matched" and "no_visible" text for TeleportHistory.
+ Added "no_visible" text for My Outfit list.
+ Fixed filtering in TeleportHistory.

Reviewed by Mike Antipov at https://codereview.productengine.com/secondlife/r/591/

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branch : product-engine

The "Add" item of wearable context menu is now disabled if multiple clothes selected
or when you can't add more wearables of the given type (max number is worn).

Reviewed by Nyx at https://codereview.productengine.com/secondlife/r/595/

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branch : product-engine

EXT-7475 FIXED Added callback to update verbs in My Inventory SP when tab in inventory panel is changed.

Reviewed by Vadim Savchuk at https://codereview.productengine.com/secondlife/r/597/

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Reviewed by Vadim Savchuk and Mike Antipov at https://codereview.productengine.com/secondlife/r/576/

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EXT-7576 FIXED 'Add to Outfit:' panel should shrink the top 'Edit Outfit' list to 1/3 the vertical height

- Increased height of 'Add to Outfit' panel and set animate for layout stack. Animate attrubute was set to true to force proper calculation of layout panels size when one of the layout panels can dynamically change its visibility

Reviewed by Vadim Savchuk at https://codereview.productengine.com/secondlife/r/588/

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branch : product-engine

EXT-7667 FIXED There is much unnecessary empty space from the right side in the Group profile information

- Increased width of layout panel and its accordion

Reviewed by Mike Antipov at https://codereview.productengine.com/secondlife/r/589/

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reviewed by Vadim Savchuk at https://codereview.productengine.com/secondlife/r/594/

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reviwed by Loren Shih at https://codereview.productengine.com/secondlife/r/575/

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made world view extend to where menu bar would normally be when in mouselook