Hi, all.

Please find attached a change set to further improve our debugger infrastructure.

- Replaces ErrorRecursion and ErrorRecursionGard with a process-local variable DebuggerErrorRecursionFlag.
- !!! Adds several tests in DebuggerTests.
- Simplifies Project >> #interruptName:preemptedProcess:
- Simplifies "Debug it" invocation. See Process class >> #forBlock:at: and senders of it such as TextEditor >> #debugIt.
- Adds PluggableTextMorph >> #debugAction and MenuItemMorph >> #debugAction. See those morph's debug menus via halo.
- Move log-file writing for low space to SmalltalkImage >> #lowSpaceWatcher.
- Adds Debugger >> #close, similar to Project >> #close.

There are still some quirks with MVC debugging but Morphic should be fine.

Best,
Marcel
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