* A bit more work on main window / document / commands stuff. This is still pretty unstable. * Enable CSV file reader also to read files with other separators (e.g. .lab files with space separators) * Show "(R)" on waveform display when resampling during playback * Add ability to import additional audio files (can't process them yet) * Fixes to spectrogram cache for multiple views * Fix to avoid floating-point exception in sparse model when resolution not set yet