MCludgeBitmap BitmapNumber.w,Width.w,Height.w,Memory.l ; Cludge bitmap from existing mem

Creates a new chunky Bitmap object from some existing graphics memory that may or
may not contain some chunky-format graphics. Ensure that you have allocated at
least 16 bytes more memory than you need as the Bitmap will modify the base
address in order to facilitate proper block-handling routines on higiher cpu's.
Width should be a multiple of 4. The base-address is modified with the
expression: (base=base+16) and $FFFFFFF0. If the autostencil feature of Mildred
is active some new memory will also be allocated for a stencil (not cludged). The
memory you cludge a Bitmap onto should generally be in fastram.