chore: rewrite TRB codes with macros (#117)

* chore: rewrite TRB codes with macros

* chore: add a changelog

* chore: add a changelog

Author: toku-sa-n

CHANGELOG.md

@@ -1,6 +1,11 @@
 # Changelog
 
 ## Unreleased - ReleaseDate
+- The most part of `trb` module is rewritten.
+    - `set_xxx(true_or_false)` methods are split into `set_xxx()` and `clear_xxx()`.
+    - Bit setters, bit clearers, and field setters now return mutable references to `Self`
+    - `transfer::SetupStage::set_trb_transfer_length` is removed.
+- Missing members and accessors of TRBs are added.
 
 ## 0.7.0 - 2021-05-12
 ### Added