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Display how many drop points were collected already.

Make sure no elements from the previous shift remain in this area before
starting the next shift.

Provide an area where shifts can display information about the current
objective(s) and their status (e.g. 1/4 bottles collected).

See merge request !41

See merge request !42

See merge request !37

Update code overview to reflect latest architectural changes and mention
that we need the latest stable rust compiler for building this project.

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