First stab at cache management backend. Everything seems to have been tested and working so far, but a number of things require a more specialized cache and can't go through the framework (e.g. user ranks which use references to map usernames to user IDs)
.mceItemFlash, .mceItemShockWave, .mceItemQuickTime, .mceItemWindowsMedia, .mceItemRealMedia {border:1px dotted #cc0000; background-position:center; background-repeat:no-repeat; background-color:#ffffcc;}
.mceItemShockWave {background-image: url(../img/shockwave.gif);}
.mceItemFlash {background-image:url(../img/flash.gif);}
.mceItemQuickTime {background-image:url(../img/quicktime.gif);}
.mceItemWindowsMedia {background-image:url(../img/windowsmedia.gif);}
.mceItemRealMedia {background-image:url(../img/realmedia.gif);}