io.root: added module to read ROOT (Omicron) files

    - TODO: add cWB reading under io.root
table: added import of Omicron reader
plotter.timeseries: modified header
plotter: added axis module and modified core

    - changed license header in core
    - small number of minor other changes
    - axis module provides methods to set axis formatting
        - only time formatting supported for now
plotter.ticks: added scale option in formatting

    - removed deprecated functions and classes
    - changed license header
plotter.table: multiple small bug fixes

    - removed set_time_format function, use set_axis_format in core
plotter.core: added auto_refresh decorators
plotter.table: added add_loudest function

    - replots the loudest event on top of data as a gold start
    - prints text in upper left with loudest event parameters
io.root.utils: minor bug fix in branches property