(font-lock-buffers): Remove.

(font-lock-buffers): Remove.
(font-lock-global-modes): Define with easy-mmode-define-global-mode.
(font-lock-change-major-mode): Remove.
(turn-on-font-lock-if-enabled): Only apply to the current buffer.
(font-lock-default-fontify-region): Extend the multiline
fontification to whole lines.
(font-lock-fontify-anchored-keywords)
(font-lock-fontify-keywords-region): If matching just one
line (with \n) only mark the \n as multiline.