[style] Allow allocation of property IDs in ccss_style_set_property().
[style] Allow allocation of property IDs in ccss_style_set_property().

Inheriting properties may require creation of previously unused IDs,
e.g. for "border" the "border-[top|right|bottom|left]" properties are
inherited separately.

freedesktop-unofficial-mirror/ccss,freedesktop-unofficial-mirror/ccss,freedesktop-unofficial-mirror/ccss