* Remove required theme aliases
Replaced uses of headerURL, accentcolor, and textcolor with theme_frame, frame, and tab_background_text. Tested and confirmed all extensions working as expected.
* Fixed another reference to headerURL
Co-authored-by: Richard Bloor <rbloor@atlassian.com>
Changes to account for the fact that "headerURL":, "accentcolor":, and "textcolor": have been replaced by "theme_frame": , "frame":, and "tab_text": respectively. In addition, removed the empty.png image files, as these are no longer needed. Also added an example of use of theme_inactive to weta_tiled.
