Draft: Teleportation items

Add items that affect player positions rather than just their dice. This branch includes the following items:

• Short range teleportation: allows the user to teleport themselves to any cell within a certain range
• Location reset: teleports a player back to their starting position

Tasks:

• Supplement item types to generate teleportation items
• Adapt game UI to allow using teleportation items
• Check if player teleports onto goal tile
• Check if player teleports onto a tile with an item

Adding these items requires additional sprites:

• Teleportation item sprite
• Sprite variant for bumping players back to their starting position
• Tile selection indicators: these should be transparent colored rectangles that highlight which tile the player has selected for teleportation; the color should indicate if the selected tile is valid

Closes #17. Also closes #21 now that the bug fixed in the ui-tweaks branch became relevant for this branch too.