Implement Jobs data structure

[psperneac]

class Job {
    +id
    +type: string
    +name: string
    +description: string
    +start: Place
    +end: Place
    +load: number # number of containers in load
    +payType: string # gold, tokens, crates, materials
    +pay: number
    +startTime: Date # date when job taken
}

• a job describes a unit of work that the player has to complete
• jobs appear in multiple states
  • in a vehicle instance (either stopped in a place or moving between places)
  • in a place stored there by a vehicle instance unload
  • in a place being offered for pickup
• each job has a type which determines special considerations for a job. future expansion
• each job consists of a load which is the number of 'containers' that have to move
• each job starts in one place and has to end in another; also has the startTime when the job was picked up
• jobs in any state are saved to db so as to not be spoofable by a player - this adds a lot of db but cannot be avoided
  • necessary for multi-player features

[psperneac]

• This proved a lot more work that initially anticipated - jobs was split into jobs for vehicles, jobs for places etc. It also became evident that all the other data structures need to be implemented at least on server side to allow for player user stories to star being designed.

Closing down this after last commit, will continue with data structures implementation