Refactor Library And Start Runtime

Signed-off-by: Will Hawkins <hawkinsw@obs.cr>

Sources/P4/Types.swift

@@ -0,0 +1,14 @@
+// The Swift Programming Language
+// https://docs.swift.org/swift-book
+
+public enum ValueType {
+    case Boolean(Bool)
+}
+
+public struct Value {
+    public var value_type: ValueType
+}
+
+public class Packet {
+    public init() {}
+}