Moved clkgen -> .clkgen and pads -> .pads

They no longer compile with the latest Chisel/FIRRTL, and
may not be supported. However, future work will need them, so
this keeps the files around but are ignored by sbt.

tapeout/src/main/scala/transforms/.clkgen/ClkSrcTransform.scala

@@ -0,0 +1,34 @@
+// See LICENSE for license details.
+
+package barstools.tapeout.transforms.clkgen
+
+import firrtl._
+import firrtl.passes._
+
+import scala.collection.mutable
+
+class ClkSrcTransform extends Transform with SeqTransformBased {
+
+  override def inputForm: CircuitForm = LowForm
+  override def outputForm: CircuitForm = LowForm
+
+  val transformList = new mutable.ArrayBuffer[Transform]
+  def transforms = transformList
+
+  override def execute(state: CircuitState): CircuitState = {
+    val collectedAnnos = HasClkAnnotation(getMyAnnotations(state))
+    collectedAnnos match {
+      // Transform not used
+      case None => CircuitState(state.circuit, LowForm)
+      case Some((clkModAnnos, clkPortAnnos)) =>
+        val targetDir = barstools.tapeout.transforms.GetTargetDir(state)
+      
+        transformList ++= Seq(
+          // InferTypes,
+          new CreateClkConstraints(clkModAnnos, clkPortAnnos, targetDir)
+        )
+        val ret = runTransforms(state)
+        CircuitState(ret.circuit, outputForm, ret.annotations, ret.renames)
+    }
+  }
+}