enh(ui): improve SSequencer appearance
Description
sight::module::ui::qt::SSequencer
could look a bit better.
Functional specifications
- Make the size of the buttons and their font customizable
- Make the selected element more visible
Technical specifications
- Add a configuration parameter to set the size of the button
- Add a configuration parameter to set the size of the font
- Add a border to the selected element
Test plan
Test with ExActivities