UI: refactor TimingParams to make it a member of TimingScene

TOFIX.md

src/UI/DocumentViews/AudioVisualizer.cc

src/UI/DocumentViews/AudioVisualizer/TimingAxis.cc

src/UI/DocumentViews/AudioVisualizer/TimingAxis.hh

src/UI/DocumentViews/AudioVisualizer/TimingCursor.cc

src/UI/DocumentViews/AudioVisualizer/TimingCursor.hh

src/UI/DocumentViews/AudioVisualizer/TimingLine.cc

src/UI/DocumentViews/AudioVisualizer/TimingLine.hh

src/UI/DocumentViews/AudioVisualizer/TimingParams.cc

src/UI/DocumentViews/AudioVisualizer/TimingParams.hh

src/UI/DocumentViews/AudioVisualizer/TimingScene.cc

src/UI/DocumentViews/AudioVisualizer/TimingScene.hh

src/UI/DocumentViews/AudioVisualizer/TimingSeparator.cc

src/UI/DocumentViews/AudioVisualizer/TimingSyl.cc

src/UI/DocumentViews/AudioVisualizer/TimingUtils.cc

src/UI/DocumentViews/AudioVisualizer/TimingUtils.hh