Add collision grid

[iRobsc]

• The collision grid should be /4 of the size of the visible tiles
• Contain tiles that are used for A* pathfinding
• Be able to handle collision that handles travelling into other rooms

I'm also thinking that the objects that gets placed out are handled by this grid. Like a tree takes up 4 tiles and a stone one tile for an example.

[willwull]

Isn't this the same as #55?

[iRobsc]

Nope, I'm thinking about closing #55 since we figured out that the player attack, monster collision and entering new rooms can be handled with other things.

[iRobsc]

55 is basically just a 4 sided box that isn't attached to a grid. Which isn't needed for now.

[iRobsc]

This is an explanation of the grid indexation. Very useful when we want to do the pathfinding algorithm.

[iRobsc]

This one is the actual "when the rows are even". The past picture should be odd rows.

[willwull]

Implemented in #83, good job bro :+1: