Issue #2000006 by ACF, juampy: Convert _file_test_form() to the new form interface and convert route.

Issue #625958 by slashrsm, quicksketch, eojthebrave, droplet, danlinn, czigor: Support Uploading Multiple Files for HTML5 Browsers via #multiple attribute.

Issue #1308054 by jthorson, brianV: Added an abstract DrupalReadOnlyStreamWrapper that other stream wrappers can extend.

Issue #1763974 by tim.plunkett, EclipseGC, berdir, xjm, neclimdul, FabianX: Convert entity type info into plugins.

Issue #1468328 by Berdir: Move file entity info, managed file, and file usage functionality into File module.

This reverts commit 45a4c447.

Issue #278425 by andypost, OnkelTem, chx, c960657, droplet et al: Fixed Using basename() is not locale safe.

Issue #334024 by klausi, catch, beejeebus, sun: Use const keyword to define constants instead of define().

Nate Lampton authored Oct 30, 2011 and catch committed Nov 01, 2011

Issue #22336 by quicksketch, scor, boombatower, and rfay. Move all core Drupal files under a core subdirectory.

- Patch #353458 by quicksketch, drewish, jpetso, sun, noahb, aaron, chx, mikey_p, dhthwy: hook_file_references() was not designed for a highly flexible field storage.

- Patch #693084 by dhthwy, jpmckinney, reglogge, clemens.tolboom, naxoc, chx: file_munge_filename() extension handling broken by move to File Field.

- Patch #777830 by Wim Leers: file_create_url() does not support protocol-relative nor root-relative file URLs.

- Patch #502190 by jhodgdon, stella, sun: hook implementation headers out of compliance with standards.

before a form builder function, to facilitate common form elements. Clean-up
from form_builder changes from CTools patch. Has nice side-benefit of making
all form functions' signatures consistent.

- Patch #331171 by pwolanin, mfb, drewish: allow modules to alter the MIME extension mapping rather than setting a huge variable.

#552066 by quicksketch and pwolanin: Fix bug with file_save_upload() and trailing slashes (with tests).

#517814 by jmstacey, justinrandell, pwolanin, drewish, Jody Lynn, aaron, dopry, and c960657: Converted File API to stream wrappers, for enhanced private/public file handling, and the ability to reference other storage mechanisms such as s3:// and flicker://.

- Patch #227232 by dopry, c960657, jmstacey, pwolanin, aaron, drewish: added initial support for PHP file wrappers.

#30520 follow-up by Dave Reid: Fix error message about upload when not uploading a file (with tests, so we don't break it again).