envy24control: port to GTK 3

alsa-project/alsa-tools pull request #35 was opened from andreas56:
This is a port envy24control from GTK 2 to GTK 3.
Note: There is another very similar port in #27, but that one isn't quite finished. I did my port before noticing that there already was one, but I have compared them now to check that I didn't miss anything. My version has more changes, as I wanted to avoid using deprecated GTK functions. It also fixes the rendering of the level meters and optimizes it a bit so the CPU load isn't much higher than it was in GTK 2.
Note 2: the fix from #31 is included in this pull request, as it is necessary for the spin buttons to work in GTK 3.
Note 3: my other envy24control pull requests are not included here, as they are not related to GTK 3. #29 will probably cause merge conflicts with this one, but I will fix them if you decide to merge any of the pull requests.
Request URL : https://github.com/alsa-project/alsa-tools/pull/35 Patch URL : https://github.com/alsa-project/alsa-tools/pull/35.patch Repository URL: https://github.com/alsa-project/alsa-tools
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GitHub pull_request - opened