[codingstd] tab in src/runcore/trace.c
[winxed] manually beautify generated winxed sources

de-anonymize subs for easier tracing
[pmc] Object.invoke as vtable override: fix unstable self heuristic

Change experimental usage of vtable overridden subs.
Only push self if the sub is a method, otherwise replace it.

Closes #1013. Thanks to Zefram