Many changes and improvements to Master Translation generator (and language files)

Changes range from minor formatting adjustments to XML output, to a new
phraseCount tag to help PD's language editor, to a new "Merge All"
option to shorten the amount of time required to update translation
files against a new master language file.
Change the way new language files are generated

The original languages files will now be backed up (renamed), and the
new ones will automatically overwrite the originals.  This saves me
having to manually back up the old files and rename the new ones.
More Language Editor framework code
New "official" progress bar class

Instead of simply painting a custom progress bar using system theme
data, this class creates an actual system progress bar.  This allows for
use of things like a "Marquee"-style progress bar, as well as the
smooth-reverse options in Vista+.
Display wait screen while changing program language

This was needed to prevent interaction while the new language is being
loaded.  A marquee progress bar is used, but it will look funny in the
IDE due to the lack of a manifest.  (It looks great when compiled,
especially on Vista+.)

The new "please wait" form is generic and can be used by any function
where an indeterminate progress bar is required.