The UI feedback when dropping scene / source items on other parts of the
program indicated that something would happen instead of showing the
"no drop" icon.
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.
Code submissions have continually suffered from formatting
inconsistencies that constantly have to be addressed. Using
clang-format simplifies this by making code formatting more consistent,
and allows automation of the code formatting so that maintainers can
focus more on the code itself instead of code formatting.
After dragging and dropping a file, the source name will be the
filename.
(Jim: When dragging and dropping raw text, the raw text would then be
used as the source's name, which is bad if there's a lot of text. It's
now been changed so that it uses the source type's display name, i.e.
"Text (GDI+)" as the source name in that case)
Closesjp9000/obs-studio#888
