Fixes for multi-platform sim builds and a '-P' option for platforms in ocpirun, plus ocpigen datawidth bug fix
core/application/src/OcpiApplication.cxx: support "platform" parameter for instances
core/application/src/ocpirun_main.cxx: ditto, using -P (not -p, which is for properties)
core/local/util/property/include/OcpiUtilImplementation.h: ditto - accessor for Attribute class
tools/cdk/include/hdl/hdl-targets.mk: enable multi-platform hdl building (many at a time) for modelsim
tools/cdk/include/hdl/isim.mk: ditto, for isim
tools/cdk/include/hdl/modelsim.mk: ditto, for modelsim
tools/cdk/ocpigen/ocpigen/include/wip.h: fix bug limiting WIP datawidth parameter >= 256