[Please Review] Debugger Fixes

- removes the intermediate role of UIManager for debugging purposes -- focus on Project+ToolSet

- deprecates Object >> #notifyWithLabel: -- use Object >> #notify:

- replaces some sends to ToolSet >> #openContext:label:contents:, which is just convenience to avoid "Processor activeProcess" ... which reduces readability of the code... :-) Usually Warning class >> #signal: will do the trick.

Best,

Marcel