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See merge request !36

Randomly choose between assembly hall and CCL for now.

A new level which only supports the bottle angel shift for now.
Notably, I did not yet add any obstacle spawn points because I was
unsure how we can make sure the player can't be trapped.

See merge request !35

Allow players to use the arrows keys as well as WASD for controlling
character movement.

Random fixes and improvements

Closes #27

See merge request engel-simulator-2020/game!34

When the player reaches 30 hours, we're currently getting a panic in
debug mode and an unhandled interger underflow in release mode.
Sidestep this by not performing the subtraction if the player has gained
enough hours.

My attempt at an ... angel.  Improvements welcome.

Fixes #27.

We do know the update timestamp already as it is passed in via
Clock::update() and saved as Clock.last_tick.  Make use of this value
instead of calling into a browser API each time.

For proper operation of the clock, it needs to be updated in those
states as well.

Some of them interfered with walls, move them slightly to fix this.

See merge request !33

Remove a left-over debug print statement.

Show a banner message that a return to heaven is imminent and count down
for 3 seconds before going back to heaven.  This makes the game flow
a bit smoother as it provides an indication to the player that the
challenge is completed now.

If the system were to run multiple times after all bottles were
collected, it would add the hours to the player's counter multiple
times.  Ensure this can't happen.

Use sprites to draw bottle drop points

See merge request !31

In case some entity needs its sprite to be offset from its position, add
an `offset` attribute to the `Sprite` component which allows doing just
that.

The offset is a translation vector from the default position.  By
default, a sprite is placed such that its center is located at the
entities `Position`.

Closes #19 and #20

See merge request !32

The `Clock` now returns a constant `frame_delta` for each frame.
To do this, it must be updated once in the `InGameState` on each
update.

This commit also fixes the diagonal movement speed by normalizing
the movement vector.

Fixes #19 and #20

gamestate: Pass frame timestamp to state update method

See merge request !30

Instead of deleting drop points on contact, change them to be an empty
drop point instead.

Drop the home-cooked temporary debug rendering system for bottle drop
points and instead use a sprite for this.

Allow passing either an ImageHandle or a `Sprite` to Sprite::new().

Query the size of the sprite on the fly during rendering.  This makes
component instanciation much easier because it no longer requires access
to the `Rendering` API.

As a later optimization, we could move this ofsetting into the
draw_image() function via a new parameter.

No match needed, for simple enums one can just convert them to their
integer discriminant with `as <int-type>`.

See merge request !26

Pass the timestamp from requestAnimationFrame() to the state update
function so the game-state doesn't have to call into JavaScript for
timestamps anymore.

Implement bottle angel shift (and the underlying shift management code)

Closes #12

See merge request !29

The GameManager provides a way for systems to schedule a transition back
to the heaven.

Add a new method to the AngelShiftImpl trait which angel shifts use to
configure any shift-specific entities, resources, and ECS systems.

As a first implementation, properly implement this for the bottle angel
shift and move the `collect_bottledrops` systems here instead of it
being a generic system.

Doing it this way, each shift can decide which levels are compatible
with it and this way we don't require that each level supports all
possible shifts.

Generate a random shift for the player when entering the heaven.
Display all meta-data for this shift in the GUI.

A new module to contain the "logic" for all angel shifts.  As an
example/first shift, introduce a "Bottle Angel Shift".

Shifts are abstracted as a trait object which contains the actual shift
logic and is dynamically selected based on RNG.

Tell a player how many hours they'll gain by doing a certain shift.

Display a cound of collected angel hours and the amount of hours still
needed for getting a shirt (currently hard-coded to 30h).

Add the count of angel hours to the player component.