[SergioRibera]

In single-line fields GameTextInput turns the return key of the soft keyboard into an editor
action ("Done", "Go", "Search", ...) and sends it as InputEvent::TextAction. The backend drops
it as an unknown event, so pressing the action key does nothing: forms can't be submitted from
the keyboard.

This reports the action as a press and release of the return key, which is what the key stands
for. Applications already handle Enter to submit a field, and there is no IME action event in
winit to report it otherwise.

InputEvent::TextAction landed in android-activity 0.6.1, hence the bump.

• Tested on all platforms changed
• Added an entry to the changelog module if knowledge of this change could be valuable to users
• Updated documentation to reflect any user-facing changes, including notes of platform-specific behavior
• Created or updated an example program if it would help users understand this functionality

[nicoburns]

Do we not need the actual event type?