Merge branch 'master' into exception_handling

# Conflicts:
#	chiselFrontend/src/main/scala/chisel3/Aggregate.scala
#	chiselFrontend/src/main/scala/chisel3/Attach.scala
#	chiselFrontend/src/main/scala/chisel3/Bits.scala
#	chiselFrontend/src/main/scala/chisel3/Data.scala
#	chiselFrontend/src/main/scala/chisel3/Printable.scala
#	chiselFrontend/src/main/scala/chisel3/SeqUtils.scala
#	chiselFrontend/src/main/scala/chisel3/StrongEnum.scala
#	chiselFrontend/src/main/scala/chisel3/core/BlackBox.scala
#	chiselFrontend/src/main/scala/chisel3/core/Module.scala
#	chiselFrontend/src/main/scala/chisel3/internal/BiConnect.scala
#	chiselFrontend/src/main/scala/chisel3/internal/Binding.scala
#	chiselFrontend/src/main/scala/chisel3/internal/Builder.scala
#	chiselFrontend/src/main/scala/chisel3/internal/MonoConnect.scala
#	src/main/scala/chisel3/Driver.scala
#	src/main/scala/chisel3/internal/firrtl/Converter.scala
#	src/main/scala/chisel3/package.scala
#	src/main/scala/chisel3/util/Bitwise.scala
#	src/main/scala/chisel3/util/experimental/BoringUtils.scala
#	src/main/scala/chisel3/util/experimental/LoadMemoryTransform.scala