regsvr32: Convert source to Unicode (version 10) (fixes bug 28189)

[Hugh McMaster]

This patch fixes bug 28189. Thanks go to Dmitry Timoshkov and Akihiro Sagawa for reviewing and approving this patch.
 
The resource string change is necessary, otherwise the char* procName argument will not appear correctly when using Unicode output. The resource string change also improves the existing error message. Please note that po translations need to be updated after the patch has been committed.
 
The patch replaces char* arrays with their WCHAR* equivalents. It also replaces ANSI functions with their Unicode equivalents.
 
Changelog: regsvr32: Convert source to Unicode (fixes bug 28189).