Editor - Piano roll and its controls

AgsAutomationEdit — edit automations
ags_automation_edit_callbacks
AgsAutomationArea — area automations
AgsAutomationToolbar — edit tool
ags_automation_toolbar_callbacks
ags_toolbar_mode_stock
AgsToolbar — edit tool
ags_toolbar_callbacks
AgsMachineSelection — machine radio buttons
AgsMachineSelector — machine radio buttons
ags_machine_selector_callbacks
AgsMachineRadioButton — machine radio buttons
AgsMeter — piano widget
ags_meter_callbacks
AgsNotebook — select channel
ags_notebook_callbacks
AgsNoteEdit — edit notes
ags_note_edit_callbacks
AgsPatternEdit — edit notes
ags_pattern_edit_callbacks
AgsScaleArea — area scales
ags_scale_callbacks
AgsScale — scale widget
ags_scale_callbacks
AgsScale — scale widget
AgsSF2Chooser
ags_sf2_chooser_callbacks