Add AICurlTimer - timer support for the curl thread.

Not used yet. Deliberately not threadsafe.
Usage the same as AIFrameTimer, upon which is was based.
Set CURLOPT_FORBID_REUSE for XMLRPCResponder

XMLRPCResponder is used to login, which is a HTTP 1.0 server
that doesn't support reuse of connections.
It's cleaner to close connections from our side too.

This changes,
0x7fffdcf93700   CURLIO      0x7fffcd86db40   * Connection #0 to host login.agni.lindenlab.com left intact
into
0x7fffdcf93700   CURLIO      0x7fffcd8b0bd0   * Closing connection #0
Added progress meter in HTTP debug console.
Merge remote-tracking branch 'singu/master'
Increase connect timeouts for capabilities that demand short transfer times.

The automatic adjustment sets the connect time to 3 seconds, which might
be a bit on the short side sometimes.

Also remove the HACK and use CurlTimeoutConnect again.
The default is still 10 seconds, but is overridden to be 30 for mesh
now (which needs a reconnect for every mesh, since LL does not support
connection reuse for mesh). Note that I never saw any successful
connect under 8 seconds while I had the connect time out at 30:
Over 8 seconds is a sure fail (except for mesh, where in rare cases
there were connect times of 15 seconds (never 14 or 16).

On quiet servers, the connect time is normally sub-second. This is
the bulk of connections for my own SL use.
CURLIO (and libcwd): add number of established connections to http console.

I need to parse the debug output of libcurl for this, and choose
to not do that for a Release build - at which point it makes little
sense to even do it for a Debug build, since also the Alpha release
are 'Release'. Even though it would probably have no impact on FPS,
there would be like two persons looking at that number and understanding
it.
Avoid running the motionblur shader if there hasn't been camera movement. Also clamp per-frame fragment velocity to reduce visual artifacts.
When requesting an avatar reload, also reload all attachments (prior to this it was not possible to actually reload attachments on non-agent avatars)
added LLProgressView::abortShowProgress. Issue upon failed login to terminate pending loginpanel destruction which was killing the actual 'new' replacement loginpanel instead of the old to-be-deleted version.
Use SHGetKnownFolderPath on vista/win7/win8, instead of deprecated SHGetSpecialFolderPath.
Added several missing mouse-event callback signals to LLUICtrl
'Typeregionname' combobox should have an empty value. Was hosing up logic in LPanelLogin::onUpdateStartSLURL.
A break was missing from case logic in LLPanelLogin::onUpdateStartSLURL
Add german translation preview (81% complete)
Fixed location combobox not updating properly when a slurl link is clicked. Reset the location combobox when a different grid is selected (added setCurrentGridChangeCallback to hippogridmanager). Moved login panel elements into a layout_stack so hiding the grid or location columns no longer leaves big empty gaps.
Merge remote-tracking branch 'aleric/master'
Merge remote-tracking branch 'melanie_t/master'
Merge remote-tracking branch 'shyotl/master'
Compile fix
Crash fix