~bduggan/raku-dawa

Show .gist for eval
fix break in other thread
fix thread indicator
set breakpoint for stop
save file, line, and stop before execution
Stability improvements

When building the AST we now put the new node after
the existing one, and use result_child to return
the first one.

Excluded more examples where this causes a problem.

Limited stopping points to certain QAST::Op's, and
at most one per line.

Keep track of code snippets during compilation.

Added dawa cli tool.

Made colors less bright.
Fix defer to next thread
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