Improvements:

• Make lvgl possible to compile to WASM using Emscripten #31 (complete example available at lvgl-rs-wasm and live on the web)
• Expose RGB values from Color #29
• Fix documentation generation, now we will be visible in docs.rs website 🥳 #41
• Fix compiler error when running the examples #40
• Updated README:
  • Added a hint to install SDL2 before running the demos on macOS #36
  • Add system dependencies for compilation #41