PortablePdbWriter should support all Debug Metadata Tables

[siegfriedpammer]

This issue tracks the list of unsupported debug metadata tables.

For the current state of this feature see the ppdb branch.

For a general overview of the format see https://github.com/dotnet/corefx/blob/master/src/System.Reflection.Metadata/specs/PortablePdb-Metadata.md

For a reference implementation see https://github.com/dotnet/symreader-converter/tree/master/src/Microsoft.DiaSymReader.Converter

For a more up-to-date list of custom debug information see https://github.com/dotnet/roslyn/blob/master/src/Dependencies/CodeAnalysis.Debugging/CustomDebugInfoKind.cs

• Document
• MethodDebugInformation
• LocalScope (Note: currently only one top-level scope is generated per method, but this should be no problem, because the decompiler assigns unique names to variables.)
• LocalVariable
• LocalConstant (the decompiler does not emit local const declarations)
• ImportScope
• StateMachineMethod
• CustomDebugInformation
  • UsingGroups
  • ForwardMethodInfo
  • ForwardModuleInfo
  • StateMachineHoistedLocalScopes
  • StateMachineTypeName
  • DynamicLocals
  • TupleElementNames
  • DefaultNamespace n/a (VB only)
  • EditAndContinueLocalSlotMap n/a
  • EditAndContinueLambdaAndClosureMap n/a
  • EmbeddedSource
  • SourceLink n/a