introduce a more compact help screen

This is inspired by splitbrain#9 but implements it in a more elegant way,
requiring less conditionals.

Merge pull request splitbrain#16 from usox/php74-compat

Ensure php7.4 compatibility

Merge pull request splitbrain#14 from treehousetim/patch-1

Add an accessor function to options for bin

splits run() function into multiple parts

The default behaviour stays the same, but child classes can now more
easily overwrite parts of the run behaviour without having to
reimplement all of the run() method

inherit from RuntimeException

avoid output when tput is missing. fixes splitbrain#5

another test

highlight current log level

remove hhvm from testing

who's using that anymore anyway?

fixed wrong parameter in exception