Highlight all PEP-0350 defined codetags

MagicPython currently only highlights a very small subset of the codetags from PEP-0350:

• NOTE: A note
• XXX: Attention
• HACK: A hack
• FIXME: Problematic code
• BUG: A bug
• TODO: Pending task

I think the full list should be included in MagicPython, or at least the rest of the top-level mnemonics:

• NOBUG
• REQ
• RFE
• IDEA
• ???
• !!!
• PORT
• CAVEAT
• FAQ
• GLOSS
• SEE
• TODOC
• CRED
• STAT
• RVD

• Editor name and version: Visual Studio Code v1.66.2
• Platform: Windows 10.0.19044
• Color scheme: Dracula
• MagicPython version: 1.1.0
• A sreenshot:
  
• 5-10 lines of surrounding code: Exhaustive list of mnemonics:

"""
## Supported:
NOTE: A note
XXX: Attention
HACK: A hack
FIXME: Problematic code
BUG: A bug
TODO: Pending task

## Not supported:
MILESTONE: 
MLSTN: 
DONE: 
YAGNI: 
TBD: 
TOBEDONE: 
DEBUG: 
BROKEN: 
REFACTOR: 
REFACT: 
RFCTR: 
OOPS: 
SMELL: 
NEEDSWORK: 
INSPECT: 
BUGFIX: 
NOBUG: 
NOFIX: 
WONTFIX: 
DONTFIX: 
NEVERFIX: 
UNFIXABLE: 
CANTFIX: 
REQ: 
REQUIREMENT: 
STORY: 
RFE: 
FEETCH: 
NYI: 
FR: 
FTRQ: 
FTR: 
IDEA: 
???: 
QUESTION: 
QUEST: 
QSTN: 
WTF: 
!!!: 
ALERT: 
CLEVER: 
MAGIC: 
PORT: 
PORTABILITY: 
WKRD: 
CAVEAT: 
CAV: 
CAVT: 
WARNING: 
CAUTION: 
HELP: 
FAQ: 
GLOSS: 
GLOSSARY: 
SEE: 
REF: 
REFERENCE: 
TODOC: 
DOCDO: 
DODOC: 
NEEDSDOC: 
EXPLAIN: 
DOCUMENT: 
CRED: 
CREDIT: 
THANKS: 
STAT: 
STATUS: 
RVD: 
REVIEWED: 
REVIEW: 
"""

まず、MagicPython に既存の codetag のハイライト定義を見つけ、issue にある PEP-0350 のニーモニック一覧と比較します。認識対象の一覧を拡張して、要求されたトップレベルのニーモニックを網羅し、その後、プロジェクトの構文ハイライトテストを実行するか、ハイライトされた Python コメントを調べて新しいタグを検証します。