Do not map LayeredPane and Terminal to the wrong MSAA role

Do not map LayeredPane and Terminal to the wrong MSAA role

Microsoft did at some point extend the roles in MSAA with two extra
roles (ROLE_SYSTEM_IPADDRESS and ROLE_SYSTEM_OUTLINEBUTTON).
These are defined in oleacc.h as:
  #define	ROLE_SYSTEM_IPADDRESS	( 0x3f )
  #define	ROLE_SYSTEM_OUTLINEBUTTON	( 0x40 )

This means that LayeredPane will map to ROLE_SYSTEM_IPADDRESS
and Terminal will map to ROLE_SYSTEM_OUTLINEBUTTON, which is
obviously wrong.

We now reserve some valuespace for more roles to reduce the likelyness of
any collisions in the future. Having the reserved area also serves
as a way of indicating the boundary between the "MSAA" enums and other
enums.

Change-Id: Ic67a1a7200382fed3040e69b3e8856376ba642ac
Reviewed-by: Frederik Gladhorn <frederik.gladhorn@nokia.com>