This patch adds the NCryptEnumStorageProviders function.
It also fixes strings bugs with the compiler taking the WCHAR "Micro" string
M\x00i\x00c\x00r\x00o\x00 as
M\x00i\x0c\x00r\x00o\x00, and so generating unexpected behaviours. The solution is
to split string constants when you hit a character that is a valid hex number, so
that the compiler doesn't interpret i\x00c\x00 (ic in WCHARs) as i\x0c\x00 (weird
string).
This implements the emulation for the ncrypt API and more specifically the smartcard
provider so that we can list available keys and certificates using pkcs11-helper.
