UI: Fix studio mode transition bugs

UI: Support URL/web DnD in linuxbrowser

It's taking up CI build time, so just remove it.

obs-plugins: Change defaults of various plugins

UI: Upgrade stream key link to button in Wizard

This allows the ability to do things such as change defaults or
properties of sources without necessarily breaking older user
configurations that had older defaults or properties.

-If the user were in the middle of a transition and clicked
the cut transition, the transitions would become borked.

-This actually disables the transition widgets, so the
user doesn't click them. Before, the disabling of the
widgets didn't work as expected. The code for enabling/disabling
them was also simplified.

-This loading of studio mode was moved in OBSInit because
the loading of transitions needs to happen first. This fixes
a bug when enabling/disabling the t-bar when the program
is first loaded. The t-bar would be disabled even if a
cut or stinger transition was not used.

-When the user would click the quick transitions, the
t-bar would be enabled even when it was not supposed
to.

win-dshow: Fix upside-down RGB DIBs

Fix regression to RGB DIB orientation according to MSDN.

Add support for checking multiple source types in Drag n Drop callback
to support overlays for linuxbrowser users. Once the "browsersource" is
available on the platform it will have priority.

Cube LUT file support

Support for URL/web link drag and drop 

Co-authored-by: NMatt Gajownik <matt@wizardcm.com>

librtmp: Allow partial success for mbedtls

UI: Fix audio restart message not hiding

UI: Display aspect ratios in video settings

Tested Cube LUT examples from Photoshop, Adobe spec, and some homebrew.

I don't know how to use the domain fields, so they are being ignored.

mbedtls_x509_crt_parse_path returns a positive number if it partially
succeeds and a negative number on complete failure. This changes the
positive result to no longer error and prevent TLS connections (OBS
verifies all endpoints so having no CA chain prevents TLS).

docs/sphinx: Fix obs_property_list_item_disable entry

obs-outputs: Fix mbedtls use of deprecated functions

mbedtls_md5_starts(), mbedtls_md5_update() and mbedtls_md5_finish()
have been marked deprecated since mbedtls version 2.7 and may go
away in the future.

These function have been superseded by versions with a return
value. They are suffixed with "_ret". We do not actually check
return values.

Also the header "mbedtls/net.h" has been superseded by
"mbedtls/net_sockets.h".

rtmp-services: Update/remove services

- Mixer OSL removed (NXDOMAIN)
- Restream.io Prague added (FTL & RTMP)
- GameTips.tv removed (NXDOMAIN on all servers)

Follow up to #2145: https://github.com/obsproject/obs-studio/pull/2145
The wizard has a stream link URL as well, adding the button in the
wizard to match. Additionally, fixing a few  errors in the UI layout
and spacing where items were not padded.

This logs the Windows release version (e.g. 1809, 1903, etc)

This uses three methods of obtaining the actual windows version,
RtlGetVersion which is the ntdll version of GetVersionEx that bypasses
the manifest check garbage, looking up the file version of a file that
is most likely to be updated per windows version (ntoskrnl), and the
registry.  Of the three values, it chooses the highest windows version
obtained by the three.

Closes obsproject/obs-studio#2294

Leak fixes

Not sure if this is a valid pattern in the Qt world though.

Instruments claims there are still more around here, but they look
internal with my limited Mac knowledge.

CMake: Fix build on ppc64