Issue #716496 by killtheliterate, rootwork: Make sure all core template files are in themeable group

- Patch #1095498 by ohnobinki: toolbar toggle link rendered without escaping ampersand as an html entity.

- Patch #740182 by aspilicious, tsi, yoroy, casey, realityloop, Jeff Burnz:  toolbar and shortcuts lack RTL styling.

#746470 by follow-up by aspilicious, Jacine, jbrown, sgabe, et al: Add border-radius for IE9 / Opera 10.50

#915174 by sdboyer, sun: Remove pointless files[] declarations on files that are not declaring classes.

- Patch #769226 by Owen Barton, sun, effulgentsia, alanburke, bleen18, mfer: optimize JS/CSS aggregation for front-end performance and DX.

- Patch #898028 by Everett Zufelt: change heading before Toolbar to 'Administrative Toolbar' instead of 'management'.

#849904 by mgifford, jasonkiss: Fixed no visual indication of current keyboard focus on links in #toolbar in IE8.

#668280 by mgifford, Jeff Burnz, jide, David_Rothstein: Fixed Toolbar font size keeps jumping around.

- Patch #620618 by sun, Damien Tournoud, JohnAlbin, makara: optimize menu tree building and use it for toolbar.

- Patch #725734 by casey, David_Rothstein, recidive, jpmckinney, aspilicious: overlay doesn't escape any page titles (residual cleanup).

#668640 by casey, aspilicious, et al: Re-implement Overlay without jQuery UI Dialog; massive performance improvement, helps address several critical issues.

- Patch #745664 by james.elliott: toolbar doesn't properly add / remove the toolbar-drawer class when collapsing and expanding the drawer.

- Patch #535066 by jide, jbrown, marvil07, yoroy, mcjim, TheRec, mr.baileys: use CSS3 / IE filter to render toolbar shadow.

#620616 by Bojhan, reglogge, lisarex, jhodgdon, and yoroy: Fix inconsistencies in menu description labeling.