widgets loading: remove wkline.h from widgets.c

we only use the config from the wkline var. if we need to pass something else we should make a new structure to do it
config: check object returned by wkline_widget_get_config

	also if there is a syntax error exit right away and don't print that the file was not found
Merge branch 'update-config' into develop

Closes #36
Merge branch 'develop' into feature/waf

Conflicts:
	src/widgets.c