- remove unnecessary casts
- convert Hashtable->Map and Vector->ArrayList
- remove dead fields

Change-Id: Id85abee74857325a113133bf61474b962256489c
Reviewed-on: https://gerrit.libreoffice.org/3430Reviewed-by: Fridrich Strba <fridrich@documentfoundation.org>
Tested-by: Fridrich Strba <fridrich@documentfoundation.org>