Fix-161 - Align rows of Params Panel and Timetrack Panel

- added a label widget to the param dock column to be able to catch style updated signal, then when the widget is drawn get retrieve the header height.
- send a signal the param dock header height has changed
- connect timetrack and curves docks to this signal to update both dock's headers

Nota : i have added some gtkmm3 commented function to make easier the migration