Hard-coding all references to EncodingAccessor.getDefault<IO>Encoding to 'UT...

...F-8'

We need to delete the older bladerunnerconf.java class from our codebase as well as EncodingAccessor but this is a larger piece of work and we want to ensure we port over test coverage/have it's equivelent.
@Ignoring tests which changed the legacy bladerunner.conf properties and expecting different encoding to be set

cc: @dchambers @andyberry88