core: include: Whitespace fixes.

Signed-off-by: Cyril Hrubis <metan@ucw.cz>
filters; Blur: Fix 'assigment discards 'const' warning'.

Signed-off-by: Cyril Hrubis <metan@ucw.cz>
filters: Add missing header for edge detection filters.

Signed-off-by: Cyril Hrubis <metan@ucw.cz>