* implement events instead of interfaces
  Interfaces and the wrappers head the problem that they could not support multiple events at once or only a single one without loosing the others.
* add text input support for WASM on mobile
  A hidden html input is required to open the keyboard and receive the
  input.
* improve the number choice
  * fix using the default number
  * add submit button only if a onclick method was provided

Simplify the Choice Widget and make it a TextBox variant.

Drive-by fixes:
  * ui.Collection: prioritize newer widgets during active widget selection
  * game.FullAction: fix incorrect cost function.
                     Full actions cost all available actions. Also
                     fix the cost check

* Generalize hover detection and move it into ui.Collection
* Implement transparencu for the prompt banner

* Fix alot of bugs caused by permanents without tiles
* Implement a permanent choice to select the permanents in a pile
* Fix how pile hooks are called