This adds the ability for users to change the names of audio sources
from the mixer including desktop and mic/aux sources.

Closes jp9000/obs-studio#1055

Allows the ability to hide/unhide sources in the mixer that the user
doesn't care about or doesn't necessarily want to see (such as video
sources that have audio but don't have any audio playing).  If all
sources are hidden, the user can right-click the mixer's empty area and
choose "unhide all" via a context menu.

Closes jp9000/obs-studio#1002

Changes the UI to an adjustable user interface, allowing the user to
fully customize how the scenes list, sources list, the mixer,
transitions, and the buttons are oriented on the main window window.

This adds a "Defaults" button in the source and filter properties, which
will clear and reset all settings.

Closes jp9000/obs-studio#875

(Edit by Jim: Removed "Fullscreen Preview" because that's already sort
of served by the normal fullscreen projector option via the preview
context menu)

Closes jp9000/obs-studio#846

Uses a named mutex to detect if multiple instances of the program are
open, and if so warns the user.  When running in portable mode, uses a
separate unique mutex name mapped to the user's config directory to
ensure that no two portable builds use the same config directory.  This
way, portable builds do not conflict with normal builds or other
separate portable builds.

Shows performance stats, and streaming/recording stats, and helps warn
the user when they have less-than-optimal values with coloring on the
values (e.g. yellow when getting low on disk space, red when getting
really low)

The auto-configuration wizard is designed to allow first-time or
novice/uneducated users or to set up video and encoding settings in a
very quick and easy way.  It'll automatically perform a bandwidth test,
and/or test the user's video settings to determine the most ideal
settings for streaming and recording (assuming a 1-pc setup).

The colon makes it difficult to use these locale items for other
purposes, and the colon isn't used much elsewhere, so just remove them.

Closes jp9000/obs-studio#841

The audio subsystem of windows is by default configured to lower the
volume of other things while a communications device (mic) is currently
active.  This patch prevents that from being enabled with OBS.  If the
user needs audio ducking enabled again for whatever reason, there is now
an option to re-enable it in advanced settings.

Closes jp9000/obs-studio#884

Closes jp9000/obs-studio#860

Closes jp9000/obs-studio#804

Closes jp9000/obs-studio#804

So many checkboxes were together almost senselessly.

This is mainly to give visual feedback to those affected by NVENC not
working with older driver versions. Currenlty obs fails silently which
could go unnoticed for users who are using hotkeys as well as confuse
users who are not trained to read their logs when issues occur.

Closes jp9000/obs-studio#788

Adds audio monitoring selection to advanced audio properties, and adds
the ability to select the device in advanced settings.

Makes it a bit more clear that this always minimizes to system tray.

Closes jp9000/obs-studio#748

This adds an option to the general settings to save the opened
projectors on exit.

(Note: Fixed conflicts -Jim)

Closes jp9000/obs-studio#743

Closes jp9000/obs-studio#737

Closes jp9000/obs-studio#721

This commit adds the ability to copy a scene item's transform and crop
settings and paste those settings onto another scene item in any scene
or scene collection. It also changes the menu shortcut key for the
Transform action "Center to screen" from "C" to "n" because "C" is the
standard shortcut key for "Copy" in most other applications.

Closes jp9000/obs-studio#719

Replay buffer and recording should be separate in case the user wants to
start recording from a specific point rather being forced to reconfigure
for regular recording.

Creates a new button on the main window below the recording button for
turning on/off the replay buffer.

It should specify that the user specifically needs to set the "save"
hotkey, not just "the replay buffer hotkey".

Adds preview scaling to the right-click context menu for the preview
pane.  This allows the ability to, for example, zoom the preview and
edit the preview 1:1 (canvas/base resolution).  This was a missing
parity feature.  Additionally, also allows scaling to the
"output/scaled" resolution the program is set to.

When the preview is in scale mode and is the focused widget, you can
hold space and drag with left click to change the zoomed position.

(Notes added by Jim)

Closes jp9000/obs-studio#687