Signed-off-by: Andrei Gherzan <andrei.gherzan@huawei.com>

Available knobs:

WESTON_INI_BACKGROUND_IMAGE - Full runtime path of the background image.
			      The base name of this path needs to be
                              available in FILEPATH (EXTRAFILESPATH).
WESTON_INI_BACKGROUND_COLOR - Background color - default to white.
WESTON_INI_BACKGROUND_TYPE  - Background type - defaults to centered.

Signed-off-by: Andrei Gherzan <andrei.gherzan@huawei.com>

Using systemd notify, a service dependency would be more robust. This
allows, for example, another service to depend on weston-init without
having to hack a sleep (or similar).

Signed-off-by: Andrei Gherzan <andrei.gherzan@huawei.com>

This creates a mechanism to generate a dynamic weston.ini configuration
based on build variables.

The entire mechanism is enabled using the WESTON_DYNAMIC_INI variable
(enabled when set to 1).

The default path for the weston.ini configuration is set in
WESTON_INI_PATH as "etc/xdg/weston/weston.ini".

WESTON_INI_NO_TOOLBAR, when set to 1, disables the weston toolbar.

Signed-off-by: Andrei Gherzan <andrei.gherzan@huawei.com>