Add additional code analysis rules #271
                
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This really depends on the core team on exceptionless and what rules they want to keep. I have pulled in the rules used by MSBuild which seemed reasonable.
dotnet/msbuild#5656
Generally with a change like this, the analysers are set to suggestions and moved to warnings or error once all instances are fixed. Each code analysis rule would be fixed in an separate PR. So this PR should be used to establish a list of rules to work against.