renaming projects should be possible

[technocake]

the project command is currently lacking a update or rename command that really should be there. If a user wants to keep all its shortcut tied to a project, but for whatever reason wants to change the name - the user should be able to.

This action will require to simply change the name of the project-file, and handle some conditionally cases:

• if the project is active, the active-project should also be updated
• if the new name already exist, the renaming should give an error.

relevant files

source:

• bin/project

state-files

• ~/.goto/active-project
• ~/.goto/state/projects/<project>/private/<project>.json
• ~/.goto/state/projects/<project>/shared/<project>.json