DTime+ v3.20

Just to let everyone know that v3.20 of DTime+ has been released. Updates for this version include:

• Updated copyright details
• Removed all usage of CString from the code and replaced with std::[w]string.
• Replaced all occurrences of WORD with uint16_t throughout the code
• Replaced all occurrences of DWORD with uint32_t throughout the code
• Replaced all occurrences of ASSERT, AFXASSUME, TRACE & VERIFY with non MFC dependent implementations
• Replaced all occurrences of long with int32_t throughout the code
• Renamed the DMYToLong method to "DMYToNum"
• Optimized the elements of the static lookup tables in CJulianCalendar::DMYToNum & CJulianCalendar::GetDate
• Replaced all occurrences of NULL with nullptr throughout the code. This does mean that the classes now require at least VC 2010 if you are going to use a Microsoft compiler.
• Reimplemented CDate::CurrentSystemDate to just use the C runtime.
• Reimplemented CDate::CurrentLocalDate to just use the C runtime.
• Optimized the CDate::Set method which takes a COleDateTime parameter
• Optimized the CLDate::Set method which takes a COleDateTime parameter
• Fixed a bug in the validation code of the CDate::Set method which takes a "WeekOfMonth" parameter.
• Fixed a bug in CJulianGregorianHolidays::EasterMonday where it returned EasterSaturday by mistake
• Fixed all typos of "occurrences" throughout code and documentation
• Optimized the CDate::Set method which takes a CTime parameter
• Optimized the CLDate::Set method which takes a CTime parameter