Japanese calendar support

Japanese people want Japanese calendar support until 2019 May 1st.

1. Japanese calendar registry info

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Nls\Calendars\Japanese\Eras
https://msdn.microsoft.com/ja-jp/windows/ee923790
https://docs.microsoft.com/ja-jp/windows/desktop/Intl/era-handling-for-the-japanese-calendar

Add JapaneseEras.reg to ReactOS.

2. Japanese Calendar APIs

Calendar ID (CALID) == CAL_JAPAN.

• GetDateFormat (important: 'g' and 'gg')
• GetCalendarInfo (important)
• SetCalendarInfo (important)

Get/SetCalendarInfo's {{CALTYPE}}s:

• CAL_ITWODIGITYEARMAX
• CAL_IYEAROFFSETRANGE
• CAL_SABBREVERASTRING
• CAL_SCALNAME
• CAL_SERASTRING
• CAL_SLONGDATE
• CAL_SSHORTDATE