Add dictionary lookups for color spaces and chroma subsampling from the ffmpeg codes.
Made the all objects validate file extensions during instantiation.
Removed get JSON method.
Wrote code for getTotalRunningTimeRaw method.
Created and wrote getVideoTotalFrames method.
Split getVideoColorSpace into colorspace and color sampling methods to give only the proper component.
Removed the TODO line to fix the getSHA1 method because it was fixed in a previous commit.