Remove LibExtra and refactor filters and steps that used it

move pipeline builder to core

move (Abstract)CompoundStep and AbstractCompoundParameters to core

Create AbstractGroupParamters (based on lib-extra AbstractParameters)

complete refactor tokenizer to solely use RBBI

delete custom SWT tokenization UI - complexity not justified

Create new simplified UI for tokenizer step

Refactor PlainText filters(s) to use core classes only.

Refactor Table filters(s) to use core classes only.

Create AbstractCompoundFilter