Moved technology_pkg.vhd and technology_select_pkg.vhd from base/ to . and remove base/.

Use ip_<device name> directories instead of following the altera/altera_mf library namings.
Move all Altera IP for Stratix IV to ip_stratixiv/ and use prefix ip_stratixiv_<component_name> for the IP files.
Remove xilinx/xilinx_core directory. Instead added ip_virtex4/ directory with empty hdllib.cfg.