Add cellular automata demos

[johnnygossdev]

Please check if the PR fulfills these requirements:

• [x] The commit message follows our guidelines.
• For bug fixes and features:
  • [x] You tested the changes.
  • [ ] You updated the docs or changelog.

Related issue (if applicable): #4

There are some changes to the initial issue which I'll highlight here.

What kind of change does this PR introduce? Three new cellular automata demos.

01.GameOfLife

• Shows the classic rules from Conway's Game of Life.
• Tiles are set as alive or dead by left-clicking. This allows the user to see how different pattern change with every step.
• This basic implementation is the scaffolding to generating dungeons; it shows how we use a map which changes after each step using a set of rules.

02.BasicDungeon

• Building on the last project, we alter the rules to generate organic looking caverns.
• We have settings that we can change:
  • Wall Chance: How likely a cell is designated as a wall during step 0. A higher chance leads to smaller, more spread out caverns.
  • Wall Conversion: Each step, a floor cell turns into a wall if it has less than this number of floor neighbors.
  • Floor Conversion: Each step, a wall cell turns into a floor if it has greater than this number of floor neighbors.
  • Step Count: How many steps run before the generation completes.
  • Step Speed: The time between steps. Used to visually show the change between different steps.

03.AdvancedDungeon

• Here we add features to create a simple, playable stage:
  • Autotiles with floor tile variances to make the caverns look more appealing (Note: the assets are placeholder.)
  • A player that moves with the arrow keys and can "dig" through adjacent wall tiles to each other caverns using SPACE.
  • An exit which will generate a new dungeon upon collision.
  • Treasure which spawns in corners. Treasure is picked up when the player collides with it.
• There are three more settings to change the feel of the dungeon:
  • Switch Camera Button: Toggles between the overhead camera and the player camera.
  • Min Exit Distance: The minimum distance in cells the exit has to be from the player.
  • Min Cavern Size: Caverns which have less cells than this value are filled in with wall tiles.
  • Maximum Treasure: The maximum number treasure scenes that spawn.

Does this PR introduce a breaking change? Nope.

[NathanLovato]

May I go ahead and make code style tweaks? It's looking good at a glance, I'd just compress some functions vertically, adding a variable here and there to clarify a long conditions, renaming a handful of files, things like those.

[johnnygossdev]

Absolutely, no problem.

[johnnygossdev]

I've updated the PR with more information and context.

[NathanLovato]

Great, thanks for your work!