Add param to force output FPS

[SuslikV]

New parameter to be able to force output frame rate.

Sometimes it is inconvenient to edit 29 FPS videos. The FPS changes affects the stream length.

[AdamSpannbauer]

Thanks for opening the PR and braving the questionable code base. This has turned up some issues in the CI pipeline. I'll look into fixing the CI and then look into testing locally.

I'm on board with the feature and just want to get these final checks. Thanks!

[AdamSpannbauer]

@SuslikV I think I have the CI fixed. I'm going to make a commit to try and trigger the build.

[codeclimate[bot]]

Code Climate has analyzed commit 41180ce1 and detected 0 issues on this pull request.

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[codecov[bot]]

Codecov Report

Merging #121 (41180ce) into master (9c443d5) will decrease coverage by 0.12%. The diff coverage is 66.66%.

@@            Coverage Diff             @@
##           master     #121      +/-   ##
==========================================
- Coverage   93.15%   93.02%   -0.13%     
==========================================
  Files          16       16              
  Lines         628      631       +3     
==========================================
+ Hits          585      587       +2     
- Misses         43       44       +1     

Impacted Files	Coverage Δ
vidstab/VidStab.py	92.57% <66.66%> (-0.35%)	:arrow_down:

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[AdamSpannbauer]

LGTM

[AdamSpannbauer]

@SuslikV I'll plan to release over the weekend. Thanks for the feature