Add a simple tile description and tiles (ground/wand tiles)

[Lycea]

A simple description could be needed for tiles of different levels to have teir tile sets kind of.
For later this makes sense for different floor / level sets to differentiate them more simple.

The tiles should come in a similar manner as the mobjects so the description should be in the way of:

local tile ={
name = "Water",
["type"] = "water",
stats ={
walkable=false,
blocked_sight = false,

}
colors={
active = "green",
inactive = "blue",
undiscovered = "grey"
}
}

also for later on only few properties should be saved in this tile, this would be:

• it's position on the map
• its status if discovered or not, since light map is calculated dynamically on startup
• its type

this later also allows for easier creation of "destroyable tiles",create a type, load it up and
then simply set a new one if destroyed, yey.
This will also aide in the case we want to set a tile set to the tiles later on ,floor and wall tiles seperate tiles ...