Move rendering related functions out of compton.c

Moved:
* Blur kernel related functions to kernel.c
* Vsync related functions to vsync.c
* paint related functions to render.c

This will make the `split-backend` branch easier to rebase.

Signed-off-by: Yuxuan Shui <yshuiv7@gmail.com>

src/meson.build

@@ -4,7 +4,8 @@ deps = [
 	dependency('xcb', version: '>=1.9.2'),
 ]
 
-srcs = ['compton.c', 'win.c', 'c2.c', 'x.c', 'config.c', 'diagnostic.c', 'string_utils.c']
+srcs = [ files('compton.c', 'win.c', 'c2.c', 'x.c', 'config.c', 'vsync.c',
+               'diagnostic.c', 'string_utils.c', 'render.c', 'kernel.c')]
 
 cflags = []