Shinylive 0.3.0

Python:

• Updated to pyodide 0.25.1.
• Updated shiny to 0.9.0.
• Updated shinyswatch to 0.6.0.
• Updated shinywidgets to 0.3.2.

R:

• Updated to webR 0.3.1, which allows much faster package loading via emscripten VFS images.
• Updated to shiny 1.8.1.1.
• Updated editor to use 2-space indents for R.