Merge function-builder branch into master

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

@@ -0,0 +1,17 @@
+package nl.astraeus.css.properties
+
+class WhiteSpace(
+    value: String
+) : CssProperty(value) {
+
+    companion object {
+        val normal = WhiteSpace("normal")
+        val nowrap = WhiteSpace("nowrap")
+        val pre = WhiteSpace("pre")
+        val preLine = WhiteSpace("pre-line")
+        val preWrap = WhiteSpace("pre-wrap")
+        val initial = WhiteSpace("initial")
+        val inherit = WhiteSpace("inherit")
+    }
+
+}