To further distance the code from having to do too much manually, the graphics context is now available as a managed class. All places that previously used obs_enter_graphics and obs_leave_graphics are now using the new gs::context class instead.
Small performance optimization as this removes the extra texture render that would be done by libobs which we don't actually need as we already have a texture to render to for it.
Rendering happens with cached Geometry that is only updated when necessary, such as when the user changes settings. This optimization was necessary to reduce CPU and GPU usage as we can simply re-use the same geomtry instead of recalculating it.
However, the actual source size was never checked. That meant that when a source changed size through any means, the filter would not update the geomtry accordingly, and the result was a squished or stretched image.
With this, the source size is now checked each tick.
Fixes#48
The number of files in the source directory was a little bit much and just made file naming more complex than it had to be. Therefore all files were moved into subdirectories where it matters.
Filters now reside in source/filters/, Sources in source/sources/, OBS Wrappers in obs/, OBS GS Wrappers in obs/gs/, Transitions will reside in source/transitions, Graphics Helpers will be in gfx/.
