Added support for radd.it embeds/ expandos.

* added expandos for radd.it links
 * duplicate expandos (for posts) now removed

* added "embedded player" option to toolbar when radd.it link present in sidebar.
Embedded sidebar <iframe> now matches URL protocol.
Changed "embedded player" verbiage to "playlister".
Added title attribute to "playlister" <li>

Because I don't know how to do 2 things in the same commit.
refactor modules['showImages'].siteModules.raddit.addPlaylistToggle
"radd.it" display name
radd.it playlister toggle option
match https://raddit.com in sidebar, extract path instead of full link
style
'raddit'-like classnames changed to 'RES-raddit'
refactored siteModules['raddit'].toggleSidebarPlaylist
radd.it sidebar embed uses sidebar width
target .side .md raddit links specifically
Merge pull request #1870 from andytuba/1865

#1865 and then some - radd.it playlists