Pyscreenrec

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- Write screenshots directly to the video stream instead of the disk.
- Delegate image writing to a separate thread.
- Use mss library instead of pyscreeze for capturing screenshots.
- Capture a part of the screen.
- Performance improvements.
- Internal refactors.
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- Remove the `HighFPSWarning` and `InvalidFPS` exception classes.
- Raise frame count by almost 2 times.
- Calling start and resume recording methods on an already running recorder instance raises a warning instead of printing, and vice versa.
- Temporary screenshots are now stored in `~/.pyscreenrec_data` folder.
- Internal refactors.
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- Manually set FPS for the screen recording, by an extra `fps` argument in `start_recording` method.
- Introduced a one more exception class named `InvalidFPS`.
- Minor bug fixes.
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- Introduced two new methods: `pause_recording` and `resume_recording` which can be used to pause and resume screen recording respectively.
- The `timeout` argument of the `start_recording` method is deprecated due to it miscellaneous behavior and clash with ability to pause and resume screen recording.
- The screen recording output video is now saved and the screenshots are deleted by `stop_recording` method .
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- First release
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