Enhance and refactor Add-Type cmdlet (#6141)

- Can compile a source from strings (TypeDefinition and MemberDefinition).
- Can compile from files.
- Can compile only to a file (without loading the produced assembly).
- Do not recompile and don't reload if the sources have not changed.
- Implement `-IgnoreWarnings` to not treat warnings as errors. By default, the cmdlet considers warnings as errors.
- Add VisualBasic support.
- Add new `-CompilerOptions` parameter to allow setting Roslyn command line parameters including:
    - Parser options.
    - Compile options.
    - Emit options.

**ATTENTION:** The `CompilerOptions` can be specified along with other options like `-OutputAssembly`, `-Language` and `-IgnoreWarnings`. The explicit setting parameters will take precedence over the same settings specified in `-CompileOptions`.

See docs about the compiler options:
https://github.com/dotnet/roslyn/blob/master/docs/compilers/CSharp/CommandLine.md
https://github.com/dotnet/roslyn/blob/master/docs/compilers/Visual%20Basic/CommandLine.md

**ATTENTION:** `-OutputType` default is `Library`. If `-OutputType` is absent the `-OutputType` default overlaps a value in `CompileOptions`. In other words output type ("target" ot "t" in command line) is always ignored in `CompileOptions`. We have to use `-OutputType` to set an output type.

assets/files.wxs

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