Main/cbinding: Add new helper functions to clear out strings (useful if they contain sensitive data). While doing this, added code to the glue init which checks if the version of the structure is compatible with what the client expects. This exposed annoying code duplication between the non-Windows/Windows implementations which is now eliminated.

capiidl.xsl: Must use xsl:key+key() to access //interface[@name=?]. Moved uppercase/lowercase code to shared style sheet.

Main/cbinding: define typedefs for enums for convenience

Main/cbinding: introduce a variant of ComSafeArrayAsOutParam which allows specifying the type, to avoid warnings when dealing with the not really existing safearrays on XPCOM

Main/cbinding: fix typo in the COM compatibility macro names for attribute setters

Main/cbinding: Add new helper function to free memory allocated by pfnSafeArrayCopyOutParamHelper, as on Windows getting the right free() function can be difficult otherwise. Fix pfnSafeArrayCopyOutParamHelper to be more robust (avoiding malloc(0) and returning bogus values in some error situations), and extend the sample code somewhat to print the groups (showing how to deal with string arrays)

Main/cbinding: final touchups, and making things as COM compatible as possible, even where it shouldn't really matter

Main/cbinding: another Windows build fix

Main/cbinding: fix a few windows build glitches

Main/cbinding: bring the C binding to a new functionality level, making them handle both COM and XPCOM based platforms, plus some xsl cleanup to eliminate the $dispatch case which was unused for many years (and will not be used again)