fdb with worker support
this is part of the donation
FLEX-34291: Merge the donated FDB with the current one.

- Re-applied previous fixes
- Kept the legacy code to evaluate expressions, the new code based on Falcon classes will be created in the Falcon repository.
FLEX-34292: Can't select another worker while a pending prompt is required
FLEX-34294: Create a base Class for workers making them debuggable via FDB
FLEX-34294: Create a base Class for workers making them debuggable via FDB
- Added the missing Apache Header
FLEX-34295: info breakpoints should now display the worker ID
FLEX-34296: Disable and Remove Breakpoint should now respect the Worker logic
FLEX-34297: FDB set a breakpoint in the wrong file when asked to be set for a file existing in another Worker
FLEX-34297: FDB set a breakpoint in the wrong file when asked to be set for a file existing in another Worker

Forgot to check that works from main worker too :P (fixed)
FLEX-34295: info breakpoints should now display the worker ID

Fix: Prevent a NPE when BP has not been resolve yet
FLEX-34332: info frame should return info in the context of the current worker.
FLEX-34333: print #<number> should be evaluated in the context of the current worker
FLEX-34334: FDB should allow to set / removed breakpoint by default in all existed and new created instances of a worker
FLEX-34342: Break and Clear command should accept paths
FLEX-34343: Remove the fdbworkers directory before to merge to the develop branch
FLEX-34346: BP in mxml inline item renderer shouldn't be consider as Ambiguous
FLEX-34347: propagate breakpoint shouldn't throw an NPE when the location is not found
Revert to previous version to stop mustella tests from failing.  Work will continue in seperate branch.
FLEX-34131 allow resource fetch attempts in frame 1