The source toolbar allows quick and easy access to properties and
filers, and shows common properties/features of a source type.  For
example, when you select a media source, VLC source, or the slideshow
source, you'll get media controls to control playback of the media.  If
you select a text source you can edit the font, color, or text if
applicable.  Or if you select a capture source, you can select the
display/window/etc to capture for that source.

If the source toolbar is not desired and is viewed as taking up valuable
space in the window, it can be disabled via the view menu.
Co-authored-by: NClayton Groeneveld <claytong1214@gmail.com>
Co-authored-by: NJim <obs.jim@gmail.com>

The files on disk are lower-case but QSS refrences them in
upper-case. Windows doesn't report errors as the platform isn't case
sensitive. Error messages are generated and icons not to render on
case sensitive platforms such as Linux and Mac

- Add pop-out and close svg icons
- Update all dark themes qss with the new icons

Co-authored-by: NJim <obs.jim@gmail.com>

Allows the ability to save replays with a button rather than with the
keyboard if desired.

Closes obsproject/obs-studio#1954

Adds an option to the right click menu in the scenes widget to switch
modes. When in regular list mode, it'll let you select grid mode, and in
grid mode, it'll let you select list mode. Grid mode changes the scenes
widget to have a grid of buttons for scenes rather than a list, much
like XSplit.

(This modifies UI, libobs, deps/obs-scripting, various cmake files)

Found using:
`codespell -q 3 -S *.ini,./UI/data/locale,./deps/w32-pthreads -L aci,dur,iff,mut,numer,uint`

Adds support for pausing recordings.  When settings are eligible for
recordings, a pause button will appear next to the recording button.  If
the settings are not eligible, it will warn the user in the output
settings that they cannot pause recordings if those settings are used.

This changes all of the icons from png to svg. With svgs, scaling is
unlimited. With the svgs, the issue of the @ symbols with the Windows
updater is no longer an issue.

I changed the colors of the icons to a light gray (#d2d2d2), in the
dark themes, because I thought they looked better with this color.

The mute, unmute, plus, minus, up, down and expand icons are from the
Feather Icons set. https://feathericons.com/

The visibility icon is from the Octicons set. https://octicons.github.com/

The locked and unlocked icons are from the Open Iconic set.
https://github.com/iconic/open-iconic

- Fixes Q_PROPERTY macro syntax
- Removes excessive notification declaration and slot
- Removes unneeded dynamic property
- Improves Themes versatility

Various tweaks and adjustments to Acri and Rachni for 23.0

Closes obsproject/obs-studio#1652

Fixes an issue with horizontal scrollbar when it was hard to drag it by
mouse in Acri theme, because active area was thinner than the visible
scroll handle.

Adds the ability to set the current palette for the program via adding
"OBSTheme" objects to the qss files.  The values for the OBSTheme object
are the values used by QPalette::ColorRole.

Modifying the global palette allows the ability to easily/quickly look
up application theme colors (especially if you would like to use them
for QML), as well as the ability to fix the hyperlink color issue.  (On
dark themes, links would still be dark blue, causing them to be
difficult to see)

Fixing a reference to Rachni theme folder, some minor tweaks and
reverting volume meter foreground colors to original brightness.

Closes jp9000/obs-studio#1169

Closes jp9000/obs-studio#1150