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/.pads/PadDescriptors.scala

@@ -0,0 +1,56 @@
+package barstools.tapeout.transforms.pads
+
+import firrtl._
+import firrtl.ir._
+
+abstract class PadOrientation extends FirrtlNode
+case object Horizontal extends PadOrientation {
+  def serialize: String = "horizontal"
+}
+case object Vertical extends PadOrientation {
+  def serialize: String = "vertical"
+}
+
+abstract class PadType extends FirrtlNode
+case object DigitalPad extends PadType {
+  def serialize: String = "digital"
+  def inName: String = "in"
+  def outName: String = "out"
+}
+case object AnalogPad extends PadType {
+  def serialize: String = "analog"
+  def ioName: String = "io"
+}
+case object SupplyPad extends PadType {
+  def serialize: String = "supply"
+}
+case object NoPad extends PadType {
+  def serialize: String = "none"
+}
+
+case object InOut extends Direction {
+  def serialize: String = "inout"
+}
+case object NoDirection extends Direction {
+  def serialize: String = "none"
+}
+
+abstract class PadSide extends FirrtlNode {
+  def orientation: PadOrientation
+}
+case object Left extends PadSide {
+  def serialize: String = "left"
+  def orientation: PadOrientation = Horizontal
+}
+case object Right extends PadSide {
+  def serialize: String = "right"
+  def orientation: PadOrientation = Horizontal
+}
+case object Top extends PadSide {
+  def serialize: String = "top"
+  def orientation: PadOrientation = Vertical
+}
+case object Bottom extends PadSide {
+  def serialize: String = "bottom"
+  def orientation: PadOrientation = Vertical
+}