Commit 8932bd39 attempted to fix the starting position when the program
started up inside of a monitor that no longer exists, but it was
incorrectly assumed that it would cause the program to automatically
center its position.  Instead it set its position to {0,0}, which is a
really awkward position.

This fixes that commit and ensures the window starts up centered to the
primary display when its saved starting position is invalid.

Tested using FTL (steam): SwapBuffers ultimately calls wgl_swap_buffers
causing an additional copy which just isn't necessary

This also causes game capture to sometimes capture overlays even when
not intended

This reverts commit bd70e73c.

Turns out the commit was due to a miscommunication -- the commit it was
fixing actually worked fine, and this fix was unnecessary.

If window capture fails to find a window with a matching title, search
for a window with the same window class additionally as a backup.

Replaces the third part of the internal window string with the class
name instead of the program path due to the fact that the program path
rarely seemed to work.

The active_refs and show_refs variable would only increment/decrement
their children if their values were 1 and 0, which means that in the
case of scenes within scenes, sub-sources of scenes within scenes would
end up having the wrong ref values.

This reverts commit a6d7cbf2.

Due to users inquiring what the "buffering" option does, it would be
best to have a bit more details in its wording as to its function.

Allows adding scenes as scene items.  Note that you will not be able to
add scenes if it detects infinite recursion (i.e. adding scene A to
scene B, then adding scene B to scene A), in that case it will just fail
to create the scene item.

Allows rendering scenes as scene items without off-screen sub-source of
the scene popping out on the sides.

Scenes have special duplication handling, so make it internally call
obs_scene_duplicate instead.

Adds a little improvement to quality-of-life, a typical "View" menu with
the ability to show/hide the following (for now):

- Listbox toolbars
- Status bar
- Transitions pane (some people don't really need/use/care about it)

Prevents it from taking up too much space from the other parts of the
main window.

Saves the scene item scale filters as strings instead of enums.  It's
important to save data in a form that won't break if an API enum
changes.

Adds scale filtering options to the scene item right-click context menu.

Allows the ability to use scale filters such as point, bicubic, lanczos
on specific scene items, disabled by default.  When using one of the
latter two options, if the item's scale is under half of the source's
original size, it uses the bilinear low resolution downscale shader
instead.

Allows forcing a specific resolution or aspect ratio on a source, with
user-defined sampling.

(Note: This also modifies libobs-d3d11 and libobs-opengl)

Allows overriding the sampler for a specific shader parameter.

Allows getting the name of a data sub-item.

Allows the ability to pad in addition to cropping.  Changes the name to
Crop/Pad filter.

(Additional edits by Jim: Greatly refactored/simplified filter code)

Closes jp9000/obs-studio#532

Instead of prefixing the color with the '#' character, just take it as
an actual integer.

Adds a function to the C-family parser to go to the next token and
create a string copy of it.  Useful for when you want to get a copy of
the next token regardless of what type it is.

Closes jp9000/obs-studio#542

Closes jp9000/obs-studio#547

Simple workaround to prevent integer division by zero in random_file
when add new source.

Closes jp9000/obs-studio#550

This allows installing the architecture independent data outside the
prefix, for example on a multiarch layout where the prefix is
/usr/{host-triplet}.

Closes jp9000/obs-studio#552

Fixes a small typo in the obs-module.h comments.

Closes jp9000/obs-studio#557

Allows the ability for users to make it so recording automatically
starts when they start streaming.  Also adds the option to allow the
recording to continue when stream is stopped.

Closes jp9000/obs-studio#554

Recent FFmpeg versions seem to have changed the default thread count for
most codecs to 1.  Use the max core count by default as it was
originally.

Allows installing a single specific file to the data/[arch] directory.

For install_external_plugin_bin_to_data and
install_external_plugin_bin_to_arch_data, they were using the
'plugin_target' variable instead of just 'target' for the plugin
directory output location, and they were using 'target' instead of
'additional_target' for the data/binaries they were supposed to be
installing.

Allows the library to be used by external plugins

Removing this union fixes the internal compile error that would occur on
visual studio 2015 update 2 and above when these variables were all in a
union.