Add GetSamplesPerFrame to QtTextReader and QtHtmlReader

[jeffski]

It looks like QtTextReader and QtHtmlReader were omitted when the GetSamplePerFrame functionality was added to other readers. Without the sample_count bad things happen to the audio, see: #913

This fix adds the same functionality, copied from the QtImageReader, to get the sample_count, and the audio issues reported in #913 seem to be resolved.

[jeffski]

This also seems to resolve issue #914

[jeffski]

Does libopenshot build in Ubuntu 22. I upgraded the other day and I am getting an error with libavresample. Looks like this build is having the same issue:

-- Found FFmpeg: /usr/lib/x86_64-linux-gnu/libavcodec.so;/usr/lib/x86_64-linux-gnu/libavformat.so;/usr/lib/x86_64-linux-gnu/libavutil.so;/usr/lib/x86_64-linux-gnu/libswscale.so;/usr/lib/x86_64-linux-gnu/libswresample.so (found version "4.4.2-0ubuntu0.22.04.1") found components: avcodec avformat avutil swscale swresample missing components: avresample

I'm not sure if libavresample is available for Ubuntu 22.

[codecov]

Codecov Report

Merging #926 (3b0f1d2) into develop (8ab0cb4) will decrease coverage by 0.03%.
The diff coverage is 0.00%.

@@             Coverage Diff             @@
##           develop     #926      +/-   ##
===========================================
- Coverage    53.66%   53.63%   -0.03%     
===========================================
  Files          182      182              
  Lines        16829    16837       +8     
===========================================
  Hits          9031     9031              
- Misses        7798     7806       +8     

Impacted Files	Coverage Δ
src/Fraction.cpp	96.77% <0.00%> (ø)
src/QtHtmlReader.cpp	0.00% <0.00%> (ø)
src/QtTextReader.cpp	0.00% <0.00%> (ø)

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[jonoomph]

Thanks! LGTM. I reran the checks and they succeeded. Not sure why they initially failed.