chore: address AssemblyInfo.
chore: address build configuration on release mode.
chore(nuget): install xunit.extensions(v1.7.0.1540).
chore(code-analysis): resolve some code analysis warnings.
chore(sln): keep the solution file to VS2010 format.
chore(nuget): enable the feature to restore missing nuget packages.
chore: enable to download nuget.exe file when it is missed.
chore(gitignore): improve git-ignore patterns.