Chisel 8 Tracker

[seldridge]

This issue exists to track work that has to be done for Chisel 8.

Can Be Done Before Release

• Deprecate chisel3.experimental.ExtModule, change to chisel3.ExtModule. ([core] Deprecate ExtModule, Params in experimental #5101)
• Deprecate chisel3.experimental.*Param, change to chisel3.*Param. ([core] Deprecate ExtModule, Params in experimental #5101)
• Deprecate HasExtModule*. ([core] Deprecate ExtModule utility traits #5102)
• Deprecate BlackBox. ([core] Deprecate BlackBox in favor of ExtModule #5103)

Right Before Release

• Move chisel3.experimental.ExtModule to chisel3.ExtModule.
• Move chisel3.experimental.*Param to chisel3.*Param.
• Remove HasExtModule*.
• Remove BlackBox.
• Delete firrtl IR
• Replace all deprecated case classes with classes
• Fix naming of some verification functions, e.g. cover._applyWithSourceLine
• Change Data equality to be structural for types and referential for values, get rid of BoxedData in Instantiate