Add project filters for Visual Studio

[ramon-bernardo]

Pull Request Prelude

• [x] I have followed proper The Forgotten Server code styling.
• [x] I have read and understood the contribution guidelines before making this PR.
• [x] I am aware that this PR may be closed if the above-mentioned criteria are not fulfilled.

Changes Proposed

• Added project filters for Visual Studio to organize files in the project.
• Improved the structure of the solution for better navigation and management.

Future work may involve separating project files into different folders for improved organization. :zap:

[ranisalt]

Future work hopefully involves ditching the vc17 thing and using CMake :laughing: