refactor_symbol_move

An idea declaration should offer a code action to move it to another. rq file.
Moving should cut the declaration from the source, insert it into the destination,
rewrite imports and references ( including comment references ), and reindex without
leaving duplicate idea rows for the old hosting file.
refactor_support refactor_changes
Implemented by reqlan-idea-refactor.ts, reqlan-code-action-provider.ts, and register-idea-refactor-commands.ts.

Interactive page: refactor_symbol_move