EnC: support EnC while attached to multiple processes

[tmat]

EnC does not support attaching to multiple processes right now.

Issues to resolve:

Let's say you're attached to multiple processes but the specific module that's being edited is only loaded in one process.

• Do we want to block the edit because the other process, where the module is not loaded does not allow it?
• What happens if we allow the edit and then the module is loaded to the process that does not allow the edits a bit later?
• What if we make an edit to a module while only attached to runtime that supports it, apply it, then the debugger attaches to another process that does not support it but also loads the module?

[tmat]

Implemented.