[enhancement] extend "vwait" with same options as "update", new syntax "vwait ?options? ?timeout? varname".

some small improvements and fixing:
- Tcl_DoOneEvent can wait for block time that was set with Tcl_SetMaxBlockTime outside an event source traversal,
  and stop waiting if Tcl_SetMaxBlockTime was called outside an event source (another event occurs and interrupt waiting loop), etc;
- safer more precise pre-lookup by options (use TclObjIsIndexOfTable instead of simply comparison of type with tclIndexType);
test cases extended to cover conditional "vwait" usage;

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