histedit: remove makedesc It's a dead code now.

histedit: use torule instead of makedesc in ruleeditor

histedit: add torule method to histedit action objects To make histedit action objects responsible for understanding the format of their action lines we are adding a torule method which for a histedit action will return a string which can be saved in histedit state or shown in text editor when editing the plan.

histedit: add verify() to histeditaction This commits splits the parsing of the histedit rule from its semantic analysis. It's necessary because sometimes we want to do first without doing the former (reading the histedit state).

histedit: add addhisteditaction decorator This decorator will is allowing us to move the registering the action in actiontable closer to the action code. Also it is storing the verb inside histedit action so the action is aware of the verb needed to trigger it.

histedit: add actions property to histedit state I want to refactor histedit to use action objects instead of (verb, rest) pairs whenever possible. At the end of this series I want the rules to be translated into action objects when reading state and translated back when writing state. All histedit internals should use action objects instead of state rules. To migrate histedti internals sequentially I'm introducing the state.actions property to translate rules on the fly so we can use both state.actions and state.rules until refactoring is done.