..Could also add some super nifty stuff later on too.  However, I think
using std::string whenever possible is probably for the best.

There was a fundamental flaw with the string type conversion functions
where the sizes were not being properly accounted for.  They were using
the 'len' value as a value for the output rather than only for the
input, which was bad because the output could have more or less
characters than the input.

When a source's private data is being created by a module, it wasn't
able to call most source functions because most functions rely on the
obs_source_info part of the context to be set.  This fixes that issue.

It was strange that this wasn't already the case because the other
context types already did the same thing.

This uses the reverse planar YUV 4:2:0 conversion shader to output a YUV
texture without having to convert it via CPU.  Again, this will reduce
video upload bandwidth usage to 37.5% of the original rate.  I suspect
this will be particularly useful for when an FFmpeg or libav input
plugin for playing videos is made.

NOTE: There's an issue with certain texture sizes right now I haven't
been able to identify, if the full size of texture data divided by the
base texture width is an uneven number, the V chroma plane seems like it
can potentially shift, though I only had this happen with 160x90
resolution C920.  Almost all resolutions tend to be even.  Needs further
testing with more devices that support planar YUV 4:2:0 output.

This adds button support to properties, which will allow a properties
pane to let the user click a button to activate something with a
particular obs context.  When pressed, the button will execute the
callback given, with the context's private data as a parameter.

This allows uploading of I420 textures and directly converting on the
GPU.  Cuts down upload bandwidth to 37.5% of original rate.

Added German translation

Unset cached variables on failure in Jansson find module

Add support for external jansson

Finnish Locale

fix typo

Hide librtmp symbols so they don't collide with system libraries

fix typo

Added Italian locale

Fix fdk-aac library search names

Add Japanese translation

Add libfdk_aac encoder module

The English locale file was a bit vague and I didn't have time to delve deep into the UI source code, so it's a bit generic.

Add Japanese translation

A few smaller fixes for the pulseaudio plugin

Character conversion functions did not previously ask for a maximum
buffer size for their 'dst' parameter, it's unsafe to assume some given
destination buffer may have enough size to accommodate a conversion.