Merge function-builder branch into master

src/commonMain/kotlin/nl/astraeus/css/properties/OutlineWidth.kt

@@ -0,0 +1,14 @@
+package nl.astraeus.css.properties
+
+class OutlineWidth(
+    value: String
+) : CssProperty(value) {
+
+    companion object {
+        val thin = OutlineWidth("thin")
+        val medium = OutlineWidth("medium")
+        val thick = OutlineWidth("thick")
+        val initial = BorderWidth("initial")
+        val inherit = BorderWidth("inherit")
+    }
+}