Refactor project structure by excluding test files from the main proj…

…ect in Cspdf.csproj, remove the outdated publish.sh script, and delete the PUBLISHING.md documentation. Update graphics drawing methods in multiple classes for improved clarity and consistency.

Remove Cspdf.Tests project and associated test files, and simplify CI…

…/CD workflows by consolidating build steps for Linux and Windows environments.

Refactor project structure by excluding test files from the main proj…

…ect in Cspdf.csproj, remove the outdated publish.sh script, and delete the PUBLISHING.md documentation. Update graphics drawing methods in multiple classes for improved clarity and consistency.