+ added startup modules for compact, large and huge model that define the
  memory model and include the common startup code prt0comn.asm (which is not
  yet adapted for the new models, but eventually will be)



git-svn-id: http://svn.freepascal.org/svn/fpc/trunk@27262 3ad0048d-3df7-0310-abae-a5850022a9f2