widl: Add a framework for automated testing of IDL files that should succeed or fail to be parsed.

[Robert Shearman]

The expected result is contained within the IDL file being tested, in 
the format of "/* @@ widltest: success|failure message */".
---
  tools/widl/Makefile.in                            |    2 +
  tools/widl/tests/Makefile.in                      |   29 +++++++++++++
  tools/widl/tests/expr_invalid_array_subscript.idl |   10 +++++
  tools/widl/tests/wide_str_literal.idl             |    3 +
  tools/widl/tests/widltest.sh                      |   46 
+++++++++++++++++++++
  5 files changed, 90 insertions(+), 0 deletions(-)
  create mode 100644 tools/widl/tests/Makefile.in
  create mode 100644 tools/widl/tests/expr_invalid_array_subscript.idl
  create mode 100644 tools/widl/tests/wide_str_literal.idl
  create mode 100755 tools/widl/tests/widltest.sh

This should aid in testing more-obscure parts of the parser that aren't 
necessarily valid when using RPC (and hence don't make sense being put 
in dlls/rpcrt4/tests/server.idl).

I have included two tests examples, one of a failure and one of a 
success. The framework should be expanded in the near future to support 
todos, but I felt it was important to get comments about the general 
idea sooner rather than later.
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