As part of the PR, it also fixes:
- Removes button aliases
- Unifies the keys in the object returned by getAllToolboxButtons and the button keys
- Makes sure that the number of buttons displayed are always the same as the number of buttons specified in the thresholds and removes the exception for not filling up the main toolbar with buttons from overflow menu when reactions button is disabled.
- Introduces a priority for buttons that will be used to fill empty spaces in the main toolbar.
Move visible logic inside each button
Move click functionality inside each button
Extract getButtons function from Toolbox components to functions file
- clicking toolbox button was keeping focus on toolbox even after mouse move(as focus would only be changed when clicking on some other element), so .toolbox-content-items:focus-within selector was returning a value even when mouse was moved from toolbox
- .filmstrip:focus-within did not seem to ever activate, I replaced with :hover since the intent was probably to keep the toolbox open while filmstrip is hovered
