ICU-10577 Changed Calendar not to use ICULocaleService which depends on language...

ICU-10577 Changed Calendar not to use ICULocaleService which depends on language fallback. The new implementation uses calendar type/weekdata cache purely based on locale's region. Also update EhiopicCalendar's constructor to select proper subtype like Islamic calendar. This change also resolves unnecessary cyclic dependency between weekdata and calendar type (See #10425).

X-SVN-Rev: 35003