Fixed bug in redundant field initializer issue.
Use ThrowIfCancellationRequested()
ValueParameterUnusedIssue: highlight only the 'get'/'set'/'add'/'remove' keyword, not the whole accessor body
Fix NullReferenceException in semantic highlighting.
Merge pull request #145 from erik-kallen/conversions-in-lambda-body

Add a ConversionResolveResult to lambda body expressions, if required
Fix NullReferenceException in SpecializedMethod.AccessorOwner
Added ABI comparer.
AbiComparer now has events for found incompatibilities.
Test demonstrating that the DeclaringType of accessors for anonymous type properties is null
Return the correct value in the DeclaringType property for accessors of anonymous type properties