Add an option to disable a given rich editor Asset site wide.

Added new column in table(default 0), label, hoverHelp and help field entry.

docs/changelog/6.x.x.txt

@@ -27,6 +27,8 @@
    if they are separated by commas.  Whitespace is ignored.  The upgrade
    script will migrate the data automatically, and hoverHelp documentation
    has been updated to reflect the changes as well.
+ - The Rich Editor now has a master reset that allows disabling any individual
+   Rich Editor across the entire site without querying the user.
 
 6.8.7
  - fix [ 1431098 ] op=becomeUser can become non-existent userIds