ep_align ep_headings2 ep_font_size ep_table_of_contents ep_font_color ep_author_hover ep_subscript_and_superscript ep_countable ep_comments_page

Plugin: add plugins

See merge request !2

Plugin: add plugins

See merge request mickge/etherpad!1

ep_align ep_headings2 ep_font_size ep_table_of_contents ep_font_color ep_author_hover ep_subscript_and_superscript ep_countable ep_comments_page

`message.padId` is normally undefined for `USER_CHANGES` messages.

This puts global state change logic with the rest of the global state
management logic. This also makes it possible to create temporary Pad
objects without triggering plugin actions.