d303Fix

v0.2

• ! not ignored in os.date(). It takes game time into formatting.
• Using os.date("!*t") you will get game time struct (hour and min are correct, game time has minute precision)
• %% string is changed to % sign like in original implementation.
• Extended tests.
• Day and month names have a long name.

v0.1

• Remove all os related bugs from addons.
• Complete list of os functions.
• Simple tests when invoking os.test()

• Current system date and time is not available (I'm still searching)
• Day of week and saving time flag is constant.
• Days and months names are only in English.