Update to Bevy 0.11

[msklosak]

This PR updates bevy-console to Bevy 0.11.

The main changes (besides README.md and doctest cleanup) are the usage of add_plugins(...) and add_systems(...) everywhere as the old add_plugin(...) and add_system(...) methods have been deprecated. A few changes were needed, such as:

• Update get_param() usage to include parameter changes from base SystemParam
• Derive Event for Bevy events
• Update tests using KeyboardInput to add the required window field (set to Entity::PLACEHOLDER)

[makspll]

Lovely, thanks so much, will look into merging and releasing this weekend :)

[makspll]

looks good!