typing and kwarg removals

[Christian-B]

Changes are typing

plus:

Added mypy bash files for local testing

Added time_left_float which does not take or return None

configs are now a SpallocConfig object rather than a dict

• all values typed

Job init has all params specified.
note: a None param is used to say do not use the value from config just use None

• default "USE_CONFIG"
• support methods to pick between param (if not default) and config
• all values are named params
• except args which can be 0 to 3 values

update method string now formatted
includes:
SpiNNakerManchester/SpiNNFrontEndCommon#1247
SpiNNakerManchester/sPyNNaker#1510 (from T_pacman)