The card itself is transparent, but it still has a size of 30% of the
viewport because the bar is based on the size of it's container.
The start bar and text can still be green and red, respectively, but the
light blue was completely out of place.
Closes#23: Main menu's start button doesn't run the get-ready timer
I made the start button go directly to `GameState::Playing`, which is
not actually the right state for beginning a new game. Swap the states
and everything works again.
Now it works!... but it runs every single frame, probably causing a
bunch of unnecessary text rendering and UI layout operations. I'll have
to come back and make it event-based at some point.
I've taken a lot directly from the Bevy UI button example.
(https://bevy.org/examples/ui-user-interface/button/)
I'll make it look better later. For now, it just needs to exist. Onward
to the UI operation system!
I want the different "scenes" to be their own plugins for ease of setup
and reading.
The main menu plugin has been renamed to have "Plugin" first. This is so
the lexical sort in the docs places all the plugins next to each other.
The "get-ready" plugin has been given an empty struct and an
`impl Plugin` to match the main menu plugin. I've started the game over
scene, but left it unimplemented.
The non-gameplay scenes are really just a bunch of widgets. I'm going to
put them all together and then bundle the functionality with some
exported plugin builders.
