refactor common parameter declaration code from defterm and param_name into a common method
refactor common parameter declaration code from defterm and param_name into a common method

MasterDuke17/rakudo,ab5tract/rakudo,cognominal/rakudo,nbrown/rakudo,niner/rakudo,niner/rakudo,softmoth/rakudo,dwarring/rakudo,b2gills/rakudo,dankogai/rakudo,labster/rakudo,ab5tract/rakudo,usev6/rakudo,azawawi/rakudo,zostay/rakudo,rakudo/rakudo,rjbs/rakudo,jonathanstowe/rakudo,tony-o/deb-rakudodaily,tbrowder/rakudo,salortiz/rakudo,jonathanstowe/rakudo,Leont/rakudo,tbrowder/rakudo,LLFourn/rakudo,softmoth/rakudo,rakudo/rakudo,jonathanstowe/rakudo,teodozjan/rakudo,sergot/rakudo,LLFourn/rakudo,pmurias/rakudo,raydiak/rakudo,tony-o/rakudo,cygx/rakudo,ungrim97/rakudo,rjbs/rakudo,azawawi/rakudo,niner/rakudo,Gnouc/rakudo,pmurias/rakudo,nbrown/rakudo,teodozjan/rakudo,b2gills/rakudo,zostay/rakudo,laben/rakudo,b2gills/rakudo,Gnouc/rakudo,tony-o/rakudo,ugexe/rakudo,lucasbuchala/rakudo,MasterDuke17/rakudo,tony-o/deb-rakudodaily,labster/rakudo,lucasbuchala/rakudo,MasterDuke17/rakudo,softmoth/rakudo,Gnouc/rakudo,nunorc/rakudo,paultcochrane/rakudo,jonathanstowe/rakudo,raydiak/rakudo,teodozjan/rakudo,rakudo/rakudo,sjn/rakudo,Gnouc/rakudo,pmurias/rakudo,Gnouc/rakudo,laben/rakudo,LLFourn/rakudo,awwaiid/rakudo,sjn/rakudo,nbrown/rakudo,samcv/rakudo,usev6/rakudo,niner/rakudo,retupmoca/rakudo,cygx/rakudo,laben/rakudo,zhuomingliang/rakudo,retupmoca/rakudo,labster/rakudo,cognominal/rakudo,tony-o/deb-rakudodaily,sergot/rakudo,zostay/rakudo,nbrown/rakudo,MasterDuke17/rakudo,ungrim97/rakudo,ab5tract/rakudo,nunorc/rakudo,dwarring/rakudo,ab5tract/rakudo,lucasbuchala/rakudo,LLFourn/rakudo,skids/rakudo,dwarring/rakudo,sjn/rakudo,awwaiid/rakudo,samcv/rakudo,softmoth/rakudo,teodozjan/rakudo,zostay/rakudo,skids/rakudo,awwaiid/rakudo,skids/rakudo,MasterDuke17/rakudo,rakudo/rakudo,samcv/rakudo,salortiz/rakudo,lucasbuchala/rakudo,tony-o/rakudo,awwaiid/rakudo,raydiak/rakudo,laben/rakudo,ab5tract/rakudo,ungrim97/rakudo,Gnouc/rakudo,labster/rakudo,sergot/rakudo,tony-o/rakudo,retupmoca/rakudo,paultcochrane/rakudo,dwarring/rakudo,rjbs/rakudo,sjn/rakudo,sjn/rakudo,tony-o/rakudo,samcv/rakudo,dankogai/rakudo,skids/rakudo,cygx/rakudo,ungrim97/rakudo,ugexe/rakudo,usev6/rakudo,samcv/rakudo,MasterDuke17/rakudo,salortiz/rakudo,nunorc/rakudo,tony-o/deb-rakudodaily,skids/rakudo,dankogai/rakudo,dankogai/rakudo,salortiz/rakudo,rakudo/rakudo,cognominal/rakudo,retupmoca/rakudo,usev6/rakudo,cognominal/rakudo,tbrowder/rakudo,cygx/rakudo,tony-o/deb-rakudodaily,dankogai/rakudo,Leont/rakudo,tbrowder/rakudo,b2gills/rakudo,azawawi/rakudo,LLFourn/rakudo,jonathanstowe/rakudo,Leont/rakudo,labster/rakudo,rakudo/rakudo,salortiz/rakudo,pmurias/rakudo,tony-o/deb-rakudodaily,tony-o/rakudo,tony-o/deb-rakudodaily,nunorc/rakudo,zhuomingliang/rakudo,azawawi/rakudo,salortiz/rakudo,labster/rakudo,cygx/rakudo,tbrowder/rakudo,zhuomingliang/rakudo,b2gills/rakudo,softmoth/rakudo,sergot/rakudo,raydiak/rakudo,ugexe/rakudo,lucasbuchala/rakudo,Leont/rakudo,awwaiid/rakudo,cognominal/rakudo,ugexe/rakudo,ugexe/rakudo,paultcochrane/rakudo,usev6/rakudo,tbrowder/rakudo,azawawi/rakudo,nbrown/rakudo,ungrim97/rakudo,paultcochrane/rakudo,zhuomingliang/rakudo,nbrown/rakudo,paultcochrane/rakudo