Interact with movement suspension

[GregHib]

Currently waiting for a position #56 isn't very useful by itself. Need an interact with object, floor item, mob, player, bot action, which will need size cache definitions to calculate positions.

[GregHib]

It will also need to return null or a failure type if can't/doesn't reach the destination.

[GregHib]

Tests:

• [x] Walk to player, if player moves, then doesn't follow
• [x] Trade player does follow them until within interact distance
• [ ] Examine mob doesn't do any movement
• [x] Talk/Pickpocket follows mob until the start of interaction
• [x] Interact distance seems to double when running
• [x] Banker interact distance is weird (more than 1?)
• [x] Mobs don't interact back until their dialogue is shown
• [ ] Mobs lose interest if the player steps more than double their interact distance away (normally 2 tiles) #105
• [ ] Run walks if 1 tile #104
• [ ] Run ends with a walk if the number of tiles moved is odd