separate workspace per parallel job with optional separate node

Now each parallel job creates separate workspace and unstash whole repository. Also it is possible to set a separate node for each of the configuration:

@Library('fwk@main')_

buildPrj(
    config:[
        [name:'sis8300l_hzb',    env:'xise-14.7',    node:'mskfwsvr'],
        [name:'sis8300l_xfelgun',env:'xise-14.7',    node:'mskfwsvr'],
        [name:'sis8300ku_hzb',   env:'vivado-2020.2',node:'mskfw1']
        ])

Default node is fw-build-host - alias configured in jenkins e.g. mskfw1