Make bool and null easier to use. am: 4268a60b05 am: c151d59747

Original change: https://googleplex-android-review.googlesource.com/c/platform/external/libcppbor/+/18638884

Change-Id: I4001b9acfb6a58a5627f45363677115cb66bfaea
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>