New DrMp3AudioImporter plugin using dr_mp3.

[williamjcm]

'Tis my first time contributing a plugin, so I might have made mistakes here and there. 😅

Review/feedback welcome!

[codecov-io]

Codecov Report

Merging #60 into master will decrease coverage by 0.09%.
The diff coverage is 78.78%.

@@            Coverage Diff            @@
##           master      #60     +/-   ##
=========================================
- Coverage   90.72%   90.63%   -0.1%     
=========================================
  Files          47       49      +2     
  Lines        4205     4238     +33     
=========================================
+ Hits         3815     3841     +26     
- Misses        390      397      +7

Impacted Files	Coverage Δ
...c/MagnumPlugins/DrMp3AudioImporter/DrMp3Importer.h	100% <100%> (ø)
...MagnumPlugins/DrMp3AudioImporter/DrMp3Importer.cpp	78.12% <78.12%> (ø)

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[mosra]

I might have made mistakes here and there. 😅

Doesn't seem so, at all :) Code looks great. Could you enable this plugin in all of package/ci (except appveyor-rt.bat and travis-android-arm.sh because those don't have OpenAL) so we can see what the CI says?

Besides that, can you add the plugin to the lists in

• doc/building-plugins.dox
• doc/cmake-plugins.dox
• doc/namespaces.dox (one @dir entry)

and, finally, to FindMagnumPlugins.cmake? Search for DrWav to see where it needs to be added, it's three places in that file.

[mosra]

Merged as fe8b709. This was great, thank you a lot!

I have to admit I didn't do a hearing test -- I assume you did ;)

[williamjcm]

I have to admit I didn't do a hearing test -- I assume you did ;)

Yeah, I did test with a bunch of audio files on my end. A game's OST, and a few loose files.