Intermediate Language syntax highlighting and original c# in comments

[waf]

Use ILSpy's sequence points feature to put original C# source code in the IL as comments. Syntax highlight that C# code, and also provide some very light syntax highlighting to the IL itself:

[codecov]

Codecov Report

❌ Patch coverage is 90.56604% with 30 lines in your changes missing coverage. Please review.
✅ Project coverage is 71.4%. Comparing base (e4d89e3) to head (6e54cf3).
⚠️ Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
...rvices/Disassembly/PortablePdbDebugInfoProvider.cs	78.0%	9 Missing and 2 partials ⚠️
CSharpRepl.Services/Disassembly/Disassembler.cs	88.7%	7 Missing and 3 partials ⚠️
...sassembly/IntermediateLanguageSyntaxHighlighter.cs	94.8%	5 Missing and 3 partials ⚠️
CSharpRepl/CSharpReplPromptCallbacks.cs	75.0%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##            main    #470     +/-   ##
=======================================
+ Coverage   70.4%   71.4%   +1.0%     
=======================================
  Files         94      96      +2     
  Lines       6837    7133    +296     
  Branches    1006    1056     +50     
=======================================
+ Hits        4815    5095    +280     
- Misses      1694    1700      +6     
- Partials     328     338     +10     

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