refs #4692 #2174 SiteSelector and AllWebsitesDashboard using AngularJS

refs #2174 this fixes a segmentation fault issue when requesting > 16k sites, still one Seg fault to fix

refs #2174 clear the sites cache after we have added all the needed information to reduce memory usage

refs #2174 add an import directory only if the asset contains an @import. Fixes a file named admin.less file in any plugin overwrites the admin.less file in Morpheus plugin

refs #2174 remove some logic from multisites API which is no longer needed as it is done in JavaScript

refs #2174 workaround for a bug in Webkit which does not apply the styles / render in this case. only if one manually adds a class afterwards and removes it again

refs #2174 remove access service in favor of writing superUserAccess info directly into a var as it is just faster and allows us to execute less code

refs #2174 removed source map mapping as it will not work on production (when merged assets is enabled it cannot find the path to this file)