Issue #835516 by aaron, girishmuraly, greg.1.anderson, chertzog, jwilson3, 32i, sarvab, Dave Reid: Add ability to edit file metadata, and fields when embedded in wysiwyg.

Issue #1825162 followup: Remove further unused icons and type_icon_directory variable since type functionality is in file_entity now

Issue #1821262 Change file_get_types to file_entity_get_types and FILE_DEFAULT_EXTENSIONS to FILE_ENTITY_DEFAULT_ALLOWED_EXTENSIONS

Issue #1051090 by amateescu, idflood, effulgentsia, mongolito404, mrfelton, RobW, Jackinloadup, Devin Carlson : Revamp file view modes: migrate media_small to teaser, media_large to full, media_preview to preview; deprecate link & original

Issue #1293908, 1293660 by Dave Reid, becw, aaron, brantwynn, askibinsky, Devin Carlson: Ensure field configuration is applied to Media library views and removed the deprecated media browser library.

Issue #1632828: Re-use the FILE_DEFAULT_ALLOWED_EXTENSIONS constant in the file_extensions variable.

Issue #1213252 by Dave Reid, bennetteson | e2thex, jerryitt, tsvenson: Added an 'Edit media' button on the media widget to allow a file's fields to be edited in a CTools modal dialog.

Issue #1015580 by Jacob Singh, Damien Tourand: Initialize media types on install and pprovide a batch op

#1049446: Provide a settings for for general media browser settings and rename dialog_theme variable

#899562 by unexpand, jackinloadup | veneti: Fixed Can not remove/unset image (and other media) assigned using multimedia asset field.

#826802: Added supported_schemes variables, got from url working again.  Also snuck in delete menu handler

Moved variables include to includes directory.  Perhaps we should do it with some others to reduce file bloat?