Add wall orientations

[DevWarr]

Previously, all wall tiles were a single square image. This PR adds extra images and code that builds the walls to be smoothly connected.

Changelog

• Adds three new images for different wall types
• Adds a utility function createWalls() to create walls around the gameboard and rooms
  • This removes some repeated code inside <GameBoard /> and stores it all into one utility
• Adds a WallTileOrientationEnum to store the different wall type classnames as variables
• Updates <Tile /> and _tile.scss to properly orient WallTiles based on their data