Useful when you need to modify transform properties of group sub-items
and have the transform available immediately (group sub-items always
automatically defer their transform update to the next frame).

When a group's transform was scaled down, that scale would not apply to
grabbing the handles of sub-items, so the "handle radius" would
incorrectly be miscalculated (the handle radius calculation for the
sub-item would be scaled down by the parent's scaling, making it too
small to grab).  Instead of calculating relative to the current parent,
this fixes the issue by operating in screen space at all times.

UI: Set replay buffer button as checkable

Fixes a bug where sources that are flipped vertically and/or
horizontally would not maintain their flipped state.

"Auto" is sort of a special use-case for certain services
(Twitch/Mixer), and the code recently added in be8ddc06 would
unintentionally override it.  This would for example cause the "Auto"
setting on Twitch to set the user to use an Asia server unintentionally
because "auto" is not in the json file.

The value of 0 can represent a valid hotkey ID, so make sure that when
we initialize a hotkey variable, that we use OBS_INVALID_HOTKEY_ID or
OBS_INVALID_HOTKEY_PAIR_ID and not 0.

This fixes a bug where scene item hotkey pair IDs would be initialized
to 0, and it would unregister valid unrelated hotkeys.  Particularly,
the start/stop streaming hotkey pair ID, which would commonly be the
first hotkey pair created, thus having the hotkey pair ID of 0.  The
start/streaming hotkey pair would unintentionally be unregistered via
code in obs-scene.c.

Fixes a design flaw where if renaming a source, the source's name would
revert if you de-focused (clicked away) from the rename edit widget.
Instead, the functionality for revert should really only just be when
the user presses the Escape key.

GUID can be generated/retrieved by both the updater thread and the main
thread, so make sure it's guarded by a mutex.

Fixes an issue where the web page could have both horizontal and
vertical scrollbars, making the information dialog page look a bit
unsightly.

Allows the ability to specify release candidate versions in the
whatsnew.json in order to allow startup information dialogs to be
displayed to the user which are specific to release candidates.

Allows specifying a release candidate version, and outputs release
candidate version variables to libobs/obs-config.h.  Useful for using
cmake to specify a release candidate version.

Originally, the build numbers 21.1.1 and  21.1.2 weren't added to the
master branch -- only to the two bugfix tag branches.  This is being
added again in order to build some test builds that don't prompt for
update.

Adds a checkbox to advanced settings that allows the user to
enable/disable browser source hardware acceleration on windows.

Allows the ability to set custom global OBS context private data for
allowing the frontend to communicate variables with plugins in an
indirect way.

These function declarations were in the wrong section.

Changes the default "preferred" GPU to the NVIDIA GPU when running the
program on NVIDIA laptops.

This reverts commit 671b6032.

Closes obsproject/obs-studio#1413

win-capture: Avoid tex size mismatch for cursor

Re-fetch texture when cursor's either width or height changed.

When the cursor icon changed and the new one has the same width or height,
it may not recreate the texture and thus cause memory access violation.

CI: Fix building libvpx dep on osx

enc-amf:  Version 2.4.2

If the user had a valid service selected, but the server that the user
originally was using is now (for whatever reason) no longer listed, the
rtmp-common service would still use that server rather than any of the
newer servers, and the user would have to physically go in to their
settings to reconfigure to get it to use that new server.

Instead, make sure that the server the user has selected exists within
the server list, and if it doesn't, use the first server in the list
instead by default.

This diff adds mbedTLS support to the obs-outputs plugin.  PolarSSL and
mbedTLS have grown so different between 2015-or-so when libRTMP was
written, and now it's no longer feasible to just use the USE_POLARSSL
flag.

This commit adds a WITH_RTMPS tri-state CMake variable (auto/on/off),
set to "Auto" by default.  "Auto" will use RTMPS if mbedTLS is found,
otherwise will disable RTMPS.  "On" will make it require mbedTLS,
otherwise fails configuration, and "Off" disables RTMPS support
altogether.

Closes obsproject/obs-studio#1360

UI: Add missing va_end() call

Because groups can now be used in multiple scenes at once, it's
important that if the user wishes to ungroup a group, that they must be
able to keep the group intact if it exists in other scenes.  This
requires duplicating all scene items (as well as their hotkey/private
data) instead of just reparenting the subitems.

This fixes an issue where if the user had the group referenced in
multiple scenes, the group would become empty in other scenes.

Adds an internal function to duplicate scene item data.

UI: Remove QNetworkReply from window-basic-main.hpp

QNetworkReply was added here in commit
5ba8b09c. Qt5Network was replaced in
commits 13bed1a4 and
39d1cda4, but this one line referring to
QNetworkReply remained. Let's finally remove it.

Update macOS CI build image, target, and deps