New emulator of the Soviet computer Vector-06C.

Features:
- Cross-platform (Windows, Ubuntu (Debian family)) CMake x32 build
- Added the Screen Keyboard Window
- CLI loading file command support
- Remapped Restart to F12
- Refactored project structure
- The main loop, event handling, and the graphics context setup transferred from FLSW to SDL3/GLAD
- Native window loading/saving dialog windows replaced with a cross-platform solution
- Updated hints

Bug Fixes:
- Fixed key handling during HW running
- Fixed Piral game (avoided touching unused flags)
- Fixed an issue of not loading fonts at startup
- Fixed minor bugs (part of SDL/ImGui/loop refactor)
- Fixed small bugs in Windows build