Implemented position remapper inside FrameMapper to fix audio noise when exporting to different fps

[jonoomph]

Implemented position remapper inside FrameMapper to fix audio noise when exporting to different fps

The FrameMapper class now receives the updated clip position and returns the correct amount of samples for a given frame number.

[codecov]

Codecov Report

Merging #578 into clip-refactor-keyframes will increase coverage by 2.29%.
The diff coverage is 96.38%.

@@                     Coverage Diff                     @@
##           clip-refactor-keyframes     #578      +/-   ##
===========================================================
+ Coverage                    49.39%   51.69%   +2.29%     
===========================================================
  Files                          129      130       +1     
  Lines                        10198    11501    +1303     
===========================================================
+ Hits                          5037     5945     +908     
- Misses                        5161     5556     +395     

Impacted Files	Coverage Δ
include/FrameMapper.h	75.00% <ø> (ø)
src/Timeline.cpp	47.48% <75.00%> (+6.39%)	⬆️
src/FrameMapper.cpp	84.32% <90.47%> (+0.99%)	⬆️
tests/FrameMapper_Tests.cpp	98.55% <100.00%> (+0.77%)	⬆️
include/effects/Blur.h	50.00% <0.00%> (-50.00%)	⬇️
include/effects/Negate.h	50.00% <0.00%> (-50.00%)	⬇️
include/Clip.h	70.58% <0.00%> (-18.31%)	⬇️
src/QtImageReader.cpp	56.20% <0.00%> (-5.12%)	⬇️
include/Timeline.h	59.45% <0.00%> (-4.18%)	⬇️
src/EffectBase.cpp	17.50% <0.00%> (-1.02%)	⬇️
... and 32 more

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