Primarily this PR is completing Step 5 of Flame's Klondike Tutorial and removing the tbc.md file ("To be continued...").
As at the end of Step 4, the Klondike Game had no animation, other than the drag-and-drop moves to play the game. It also had no ways to detect a win, react to a win or play again without re-loading and re-running the whole app. Step 4 played the Klondike Draw 3 variation of Klondike. Step 5 introduces the easier Klondike Draw 1 variation and provides buttons to:
Choose between Draw 1 and Draw 3,
Start the game again with a new deal, or
Start again with the same deal as before.
The new code and step5.md tutorial text cover Effects and EffectControllers in some detail, with complex examples of their use. The animations include:
Returning dropped but misplaced cards to the places they came from,
Settling dropped and validly placed cards into position,
Flipping cards from Stock Pile to Waste Pile,
Turning cards over on the Tableau piles when the cards above them are moved away,
Collecting multiple cards when the game is over,
Dealing and re-dealing multiple cards,
Allowing a card to be auto-moved onTapUp() to its Foundation Pile if it is ready to go out,
Providing a display of moving cards when/if the player wins.
It doesn't make any sense for HasGameReference to have Game as a base instead of FlameGame since the mixin is on Component and clearly in a component tree context, so this PR sets the base to be FlameGame (like HasGameRef).
This PR adds the following lint rules to our list:
```
always_put_required_named_parameters_first
avoid_multiple_declarations_per_line
avoid_positional_boolean_parameters
avoid_returning_null_for_void
avoid_returning_this
avoid_unnecessary_containers
enable_null_safety
library_private_types_in_public_api
no_leading_underscores_for_library_prefixes
no_leading_underscores_for_local_identifiers
prefer_null_aware_method_calls
tighten_type_of_initializing_formals
unnecessary_late
use_setters_to_change_properties
```
And these rules were considered, and some changes were made according to
them as a clean-up, but in many places they didn't make sense
(`prefer_asserts_with_message` I would have included, but there were too
many places that needed to be changes):
```
collection_methods_unrelated_type
prefer_asserts_with_message
avoid_renaming_method_parameters
```
