colorscheme: Make use an abstract method

The `use` method has always been decorated as being a `@staticmethod`.
Many colorschemes use fields to store certain properties, these then
need to be accessed using `self`. This isn't possible with a static
method so they override it with a regular method. This is fine as far as
Python is concerned but PyLint doesn't like the `self` parameters adding
an argument to the method.

All colorschemes should actually implement the `use` method anyway so
making it an `@abstractmethod` seems appropriate and allows us to
include the `self` argument.

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