refactor: modernize build system, add tests, CI, and auto-versioning

[halfguru]

Summary

Complete overhaul of the procon2droid Magisk module with modern tooling and practices.

Note: This PR was created with AI assistance.
Important: This has not been tested on actual hardware. The author will need to verify functionality on their Android device with a Nintendo Switch 2 Pro Controller.

Changes

Build System

• Replace monolithic source files with CMake + Ninja build
• Add CMakePresets.json for native (tests) and Android cross-compile
• Auto-generate module.prop from CMake version via configure_file (single source of truth)

Code Quality

• Restructure src/ into common/, enable/, rumble/
• Modern C++20: constexpr, std::array, std::span, std::optional, std::copy
• Use std::unique_ptr with custom deleter for DIR* RAII (no hand-rolled classes)
• Add const correctness, standard EXIT_SUCCESS/EXIT_FAILURE return codes
• Add file header comments explaining each component

Testing

• Add 18 Catch2 tests for init sequence and haptic report
• Tests run natively on Windows/macOS/Linux via CMake presets
• Note: Tests cover pure logic only. Device interaction requires real hardware.

CI/CD

• GitHub Actions: lint (clang-format + clang-tidy), test, Android cross-compile
• Cross-compile for arm64-v8a and armeabi-v7a with NDK r27c
• Auto-strip Android binaries, package Magisk zips on releases

Service Script

• Replace pgrep substring matching with PID file tracking
• Add timestamped logging, cleanup traps, binary sanity checks
• Handle enable exit status and controller removal gracefully

Tooling

• Add .clang-format (LLVM style), .clang-tidy with suppressions
• Add .gitignore, .gitattributes with LF normalization