support for ANYPTR and SYSTEM.PTR added to Meta.LookupPath. Refs: #51.
Inspired by the proposal in CPC 1.7 rc5 for adding support for ANYPTR.
Support for SYSTEM.PTR added.
Support for ANYPTR simplified and combined with SYSTEM.PTR.
Docu for Meta updated.

Signed-off-by: Josef Templ <josef.templ@gmail.com>