Coder actions should be defined like the inspector actions

Right now, Coder class actions are defined with a gtCoderAction: pragma.

An inspector action is defined with a unary gtAction.

We should transform the Coder actions to use the same mechanism and not put the priority in the selector.

Just to be clear: would you like the actions to be gtActions?

Yes. Much like how a gtCoderView is just a gtView. We basically should be able to have all buttons from Coder in the inspector.

All buttons in the toolbar are now regular gtActions. Right now, the actions are defined in the coder toolbar element, but they should probably move into the coder instead.

The actions should be defined in Behavior and subclasses.

Those last three commits were meant to reference #2103 instead 🤦

This is what coder actions look like now.