Fft changes (#15)

* modified CustomBundle to also apply on Int

* programmatic bundle should take T <: Data instead of Data

* turns out indexedElements doesn't synthesize

* had to change a bunch of files to get clk/pads compiling again with recent firrtl mods

tapeout/src/test/scala/transforms/ResetInverterSpec.scala

@@ -3,7 +3,6 @@
 package barstools.tapeout.transforms
 
 import chisel3._
-import chisel3.util.RegInit
 import firrtl._
 import org.scalatest.{FreeSpec, Matchers}