pus service testin separate file

validity buffer length is printed ti check whether it works
exception handling for setting up com if

Arg Parser can now prompt values from user if no parameters are
specified

TMTC receiver bugfixes

in serial mode

commit b4795b4a
Author: Robin.Mueller <robin.mueller.m@gmail.com>
Date:   Thu Jan 2 21:24:24 2020 +0100

    listener mode notification print

commit db2c26db
Author: Robin.Mueller <robin.mueller.m@gmail.com>
Date:   Thu Jan 2 00:05:37 2020 +0100

    tmtc adapted for serial send and receive

commit faf01c5a
Author: Robin.Mueller <robin.mueller.m@gmail.com>
Date:   Mon Dec 30 20:55:36 2019 +0100

    service 3 testing first custom definition added

commit b8052826
Author: Robin.Mueller <robin.mueller.m@gmail.com>
Date:   Mon Dec 30 20:21:22 2019 +0100

    tmtc refactoring, service 3 tm and tc handling continued

commit 2774a1c2
Author: Robin.Mueller <robin.mueller.m@gmail.com>
Date:   Mon Dec 30 01:12:54 2019 +0100

    hk service print init, hk service test plan added

commit 03596fa7
Author: Robin Mueller <robin.mueller.m@gmail.com>
Date:   Sun Dec 29 02:06:03 2019 +0100

    tmtc script service 3 init

Unit Test runs a lot faster now.