Refactor: Core: ClassConfiguration: Separate BaseActions

[Xian55]

Readme: Update and tidy up doc

Breaking Change in ClassConfig files:

• BaseAction Key are now nested, the {KeyAction}Key strings have been removed.
• Please read more BaseActionKeys in the readme page

Old:

{
    "MountKey": "N0"
}

New:

{
    "Mount": { "Key": "N0" }
}