Fix for a crash which happened because:

Fix for a crash which happened because:

Scalos patches in EMU mode the functions
AddAppIconA()
AddAppMenuItemA()
AddAppWindowA()
RemoveAppIcon()
RemoveAppMenuItem()
RemoveAppWindow()

The first 3 functions return a Scalos specific structure [1] which was NOT compatible with AROS.
Scalos calls unpatched AddAppWindowDropZoneA() which causes crashes because of different
offsets of the structure elements.

This fix:
- changes the AROS specific AppXXX structures so that the elements till the object pointer have
  the same offsets
- adds a APTR Dummy[3] at a place where Scalos has some private fields to avoid interference.

[1] struct AppObject in
    https://sourceforge.net/p/scalos/code/904/tree/trunk/main/scalos_structures.h

git-svn-id: https://svn.aros.org/svn/aros/trunk/AROS@43725 fb15a70f-31f2-0310-bbcc-cdcc74a49acc