Kate Part:
* implement KTE::Command/CommandInterface changes
* add possibility to put any commandline command into the GUI
That inclues a new kate part config page. Right now, the actions are
not implemented, so the actions in Tools > Commands are dummy entries.
But I want feedback, whether the current gui editor is usability-wise
a good idea (I doubt so far :) ).

KTextEditor::Command extended with:
* QString Command::name( const QString& command_string );
* QString Command::description( const QString& command_string );
* The name is a short text, like 'Sort', 'Insert Date' etc.
* The description is a text for the status bar for example.