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Remove filter.hpp, which wasn't included by any file, and relied on pane.hpp indirectly via one of the lines removed in this commit. The sorting functionality seems to have moved into pane.cpp when matrix.hpp was added. Note: there are two other unrelated `filter.hpp` files. Header pane.hpp is only used by matrix.hpp, pane.cpp, and window_builder.cpp; the class is also used via a forward-declaration in window.hpp, which friends it, allowing a call to window::layout_linked_widgets. The class is also made accessible via REGISTER_WIDGET. Part of #6540.