sqapi: add possibility to create static member functions

git-svn-id: svn://tron.homeunix.org/simutrans/simutrans/trunk@7414 8aca7d54-2c30-db11-9de9-000461428c89
CODE: wkz_remover_t can remove objects of type specified by default_param

git-svn-id: svn://tron.homeunix.org/simutrans/simutrans/trunk@7415 8aca7d54-2c30-db11-9de9-000461428c89
sqapi: enable creating, modifying, deleting of labels/marker

git-svn-id: svn://tron.homeunix.org/simutrans/simutrans/trunk@7416 8aca7d54-2c30-db11-9de9-000461428c89
sqapi: added coord::href, coord3d::href

git-svn-id: svn://tron.homeunix.org/simutrans/simutrans/trunk@7417 8aca7d54-2c30-db11-9de9-000461428c89
CODE: do not include koord.h in scr_coord.h anymore

git-svn-id: svn://tron.homeunix.org/simutrans/simutrans/trunk@7418 8aca7d54-2c30-db11-9de9-000461428c89
CODE: reduce code duplication in ribi_typ

git-svn-id: svn://tron.homeunix.org/simutrans/simutrans/trunk@7419 8aca7d54-2c30-db11-9de9-000461428c89
CODE: calc_richtung can take koord and koord3d as input parameters
CODE: remove unnecessary get_2d() calls

git-svn-id: svn://tron.homeunix.org/simutrans/simutrans/trunk@7420 8aca7d54-2c30-db11-9de9-000461428c89
CODE: remove superfluous get_2d() calls

git-svn-id: svn://tron.homeunix.org/simutrans/simutrans/trunk@7421 8aca7d54-2c30-db11-9de9-000461428c89