internal: solve CMakeLists.txt conflicts forever

[Pospelove]

[!IMPORTANT] Introduces dynamic CMake project management using cmakeproj.cmake files to automate project inclusion and prioritize build order.

• CMake Configuration:
  • Replaces hardcoded add_subdirectory calls in CMakeLists.txt with dynamic project inclusion based on cmakeproj.cmake files.
  • Projects are now added to CMAKEPROJ_PROJECTS_LIST if they contain a cmakeproj.cmake file.
  • Projects are sorted and added based on defined priorities in cmakeproj.cmake files.
• Project Management:
  • Adds cmakeproj.cmake files for each project directory (e.g., client-deps, libespm, papyrus-vm, etc.) to define project inclusion and priority.
  • Priorities are set for each project to manage build order effectively.
• Unit Tests:
  • Updates unit/CMakeLists.txt to conditionally include unit tests based on BUILD_UNIT_TESTS and EMSCRIPTEN flags.

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