MAINT-2980 Fix for mac cutting texture memory in half (now that we're cutting texture memory to default to 1/3rd of installed ram, pre-cutting is redundant).

MAINT-2980 Fix for AMD cards reporting system ram + vram for dedicated vram -- use WMI instead of DxDiag to get dedicated video memory.

MAINT-2980  Up texture memory slider cap to 4096MB.  Make "Texture Memory" default to 1/3rd of video memory.  Add description on debug setting and tooltip to explain why.

STORM-2035 - Invert the background color in script editors for highlighting sections. Since the background color can be changed by the user, this ensures distinctive highlighting

STORM-2036 - Fix trying to parse caps too early by adding a callback to check region caps when they haven't already been received

BUG-6425 - Init default keywords file during ctor so we have something to fallback on should caps or fetch fail

DRTVWR-354 : Rewrite Responders for Twitter and Flickr to conform to new LLHTTPClient interface. Fix merge error in Facebook connect as well

use of setGetStatus() in case the baked texture service changes
introduced some sort of hidden (and wrong) dependency.  Left
out the ridiculous duplicated invocation inside that failure status
block.  Someone damaged texture console again and apparently didn't
even bother to look at their work.  I'm sure they documented
their changes on the public wiki as well.  Unified the logging
tag throughout lltexturefetch.cpp.  Only way to get the cut-n-
pasters to do the right thing.

* Move file fetched callback to the singleton and handle all syntax id changes within the singleton
* Remove a fair number of bool checks and method relying more on callbacks to drive syntax changes.
* Don't pretty print the cache file to conserve space and to speed up xml to llsd parsing
* Clean up includes