Line-wrap privacy notice. Use <> around URL and end sentence with '.'.

Include privacy notice in help text for zcashd -help.

Signed-off-by: Daira Hopwood <daira@jacaranda.org>

src/util.h

@@ -141,6 +141,9 @@ void ShrinkDebugFile();
 void runCommand(const std::string& strCommand);
 const boost::filesystem::path GetExportDir();
 
+/** Returns privacy notice (for -version, -help and metrics screen) */
+std::string PrivacyInfo();
+
 /** Returns licensing information (for -version) */
 std::string LicenseInfo();