v0.2.0

The main focus for the 0.2.0 version was to improve the integration of the egui crate with Notan, along with some improvements and fixes:

• Updated all dependencies to the latest version available
• Migrated from 2018 edition to 2021
• Added drag and drop file support
• Added custom mouse cursors support
• Added browser links support
• Added lazy loop mode
• Added sRGB texture support
• Added Lines and LineStrip primitives
• Added new examples and improved the main page
• Added support for premultiplied alpha images
• Re-exported glam types as part of notan_math
• Renamed VertexFormat to more explicit names
• Improved the API used to call egui code.
• Other minor fixes and changes...