hdl/*/dsp_cores_pkg.vhd: move package and add new modules
hdl/*/Manifest.py: update various Manifests
scripts/*: add missing scripts and cosmetic changes

cherry-pick commit from branch master
hdl/*/wb_un_cross/*: remove package dependencies
hdl/*/wb_un_cross/*: remove custom_wishbone package reference
hdl/*/wb_un_cross/*: change generic to type natural