feat: hilbish.actions interface

[TorchedSammy]

the purpose of this will be to store some sort of global stack to have a unified interface for undoing (and redoing..?) shell actions. a couple ideas in mind for undoing things:

• history delete done by feat: delete history in ctrl r menu #242
• an rm command
• text input or transformation

this will be stored in the form of a stack (or would it be a delayed fifo?)

there are 2 ways it can operate:

• 5s after an action is pushed (of course time configurable), it is actually performed. this can be done easily via timeout api
• before truly exiting the shell, just perform all actions one after the other

the expected functions for this interface:

• push(action): pushes a new action to the list
• pop(): pops the latest action
• get(id): retrieve an action by its id
• perform(id): perform the action that has the appropriate id

an action is a simple object that has the following properties/functions

• performer: a function that will do the stated action. with the example of the history delete, this callback will actually run the hilbish.history.delete function or similar
• undoer: if the action is not destructive and the person wants to undo, this callback will be called
• id: a unique id to refer to the action