Completely removes the build dir in favor of cmake based build layouting

Fix Jansson dependency importing

Fix bug where updates for windows would check for mac updates and vise
versa.

(I am ashamed)

There's no need to initialize the map value to 0.  What was happening is
that obs_scene_add was adding a ref to a non-existent value, which
simply created it and added 1, which is perfectly fine.  Then,
obs_add_source would set the ref to 0, overwriting the existing value.

So this meant that if you didn't call them in the right order, it
wouldn't work properly, and would break, which was pretty stupid.

Turns out that if you access a map value that doesn't exist, it'll
create one with the default constructor of that type.  In this case, int
will initialize to 0, which was exactly what we wanted in the first
place, and defeats the purpose of even needing to initialize the value
to 0.  So, there's no need to manually set it to 0 in
OBSBasic::SourceAdded, or worry about the order in which the functions
are called.

Just goes to show you have to be careful with reference counting.

This is more of a temporary fix for the time being, it needs to handle
blend state changes better, perhaps via push/pop of state changes

Closes #181

Fixes #177

Currently the Info.plist file names the app package as OBS.app and cmake
is trying to use 'OBS Studio.app'.  I renamed it to OBS for the time
being just because we don't currently have actual studio interface yet.

Simple volume meter widget

Latest translations from CrowdIn

I didn't understand how tags worked so I was trying to filter it out
when I should really be using it for the actual version string.

Instead, just use separate version and download entries.

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Also use lightweight tags for git describe