Add functionality to adjust properties for each tile in tileset

[boaromayo]

These features allow the user to tinker the properties for each Tile in an active Tileset.

The user can decide whether:

• If a Tile is "solid," or if the player collides with this Tile.
• If the Tile deals damage to the player.
• If the Tile is transparent (though I might change this from a boolean to having each Tile take in alpha values from 0 to 100).

This might be useful if the user wants to easily add characteristics for each Tile.