Update NuGet packages; add more OS for CI testing (#84) · sungaila/PDFtoImage@b288a7c

Node.js 16 actions are deprecated. Please update the following actions to use Node.js 20: actions/cache@v3. For more information see: https://github.blog/changelog/2023-09-22-github-actions-transitioning-from-node-16-to-node-20/.

Remove this commented out code. (https://rules.sonarsource.com/csharp/RSPEC-125)

Rename this enumeration to match the regular expression: '^([A-Z]{1,3}[a-z0-9]+)*([A-Z]{2})?s$'. (https://rules.sonarsource.com/csharp/RSPEC-2342)

Remove this empty class, write its code or make it an "interface". (https://rules.sonarsource.com/csharp/RSPEC-2094)

Remove the unused private field 'Release'. (https://rules.sonarsource.com/csharp/RSPEC-1144)

Remove the unused private field 'FFI_Invalidate'. (https://rules.sonarsource.com/csharp/RSPEC-1144)

Remove the unused private field 'FFI_OutputSelectedRect'. (https://rules.sonarsource.com/csharp/RSPEC-1144)

Remove the unused private field 'FFI_SetCursor'. (https://rules.sonarsource.com/csharp/RSPEC-1144)

Remove the unused private field 'FFI_SetTimer'. (https://rules.sonarsource.com/csharp/RSPEC-1144)

Remove the unused private field 'FFI_KillTimer'. (https://rules.sonarsource.com/csharp/RSPEC-1144)

Remove the unused private field 'FFI_GetLocalTime'. (https://rules.sonarsource.com/csharp/RSPEC-1144)

Provide feedback