fixed SDL-d.lib issues

SDL-d.lib was not tied to debug info, so it needed to be recompiled with
the debug info attached
Edited and added new exception classes

structured exception classes to be more like Java. Added
IllegalDateTimeFormatException class, along with its subclasses.
added posixtime and time64 helpers

Added helper modules posixtime and time64 to assist with inconsistencies
across platforms with time_t and time functions, and to allow for 64 bit
time datatype
Began work on DateTime object