Audio effects

[BrennoCaldato]

Adding new audio effects to Openshot

• Compressor: Reduce the volume of loud sounds or amplify quiet sounds.
• Delay: Adjust the synchronism between the audio and video track.
• Distortion: Alter the audio by clipping the signal.
• Echo: Reflection of sound with a delay after the direct sound.
• Expander: Louder parts of audio becomes relatively louder and quieter parts becomes quieter.
• Noise: Random signal having equal intensity at different frequencies.
• ParametricEQ: Filter that allows you to adjust the volume level of a frequency in the audio track.
• Robotization: Transform the voice present in an audio track into a robotic voice effect.
• Whisperization: Transform the voice present in an audio track into a whispering voice effect.

Icons:

[codecov]

Codecov Report

Merging #700 (60c19f1) into develop (ed1bee3) will decrease coverage by 3.40%.
The diff coverage is 0.00%.

❗ Current head 60c19f1 differs from pull request most recent head 66f3ae1. Consider uploading reports for the commit 66f3ae1 to get more accurate results

@@             Coverage Diff             @@
##           develop     #700      +/-   ##
===========================================
- Coverage    50.42%   47.01%   -3.41%     
===========================================
  Files          155      175      +20     
  Lines        13292    14256     +964     
===========================================
  Hits          6702     6702              
- Misses        6590     7554     +964     

Impacted Files	Coverage Δ
src/EffectInfo.cpp	0.00% <0.00%> (ø)
src/Frame.h	100.00% <ø> (ø)
src/audio_effects/Compressor.cpp	0.00% <0.00%> (ø)
src/audio_effects/Compressor.h	0.00% <0.00%> (ø)
src/audio_effects/Delay.cpp	0.00% <0.00%> (ø)
src/audio_effects/Delay.h	0.00% <0.00%> (ø)
src/audio_effects/Distortion.cpp	0.00% <0.00%> (ø)
src/audio_effects/Distortion.h	0.00% <0.00%> (ø)
src/audio_effects/Echo.cpp	0.00% <0.00%> (ø)
src/audio_effects/Echo.h	0.00% <0.00%> (ø)
... and 32 more

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[jonoomph]

LGTM! This is honestly a really huge change, but it's fantastic! Nice work @BrennoCaldato !!!