set the number of entries in constructor of Regfile class not in XSParameters

Todo: connect them

Todo: support more policies

Todo: support more policies

New DataArray will be used as immArray and payloadArray in IssueQueue.

TODO: fix wfi bug in misc-tests

In other words, rm param/if-else from extraio(csrio/frm/fence)

In order to make different bundle of Int and Vec to look like the
same or to use as the same, add a method to include both.
Such as:
issue: {
  val issueInt
  val issueVec
  def issue = issueInt ++ issueFp
}
or Exu's FuIn: {
  val fromInt
  val fromVec
  def fuIn = fromInt or fromVec
}

Unify different type of bundle by the "def" method.

There are actual useful changes besides coding style. Meaningful
changes that makes codes more clean by divides int/fp/vec into their
sub-class will be done later.

Creates ExuBlock/FUBlock/Schduler's sub-class. The sub-class has
not meaningful codes now.