Snapshot reprentation

Goals:

• Can be used to render

• Can be produced by game implementation

• Can be serialized into DDNet demo

• Can be deserialized from DDNet demo

• Can be used as input from game implementation

• valid utf-8

• no allocations

• usability first

Goals, if it doesn't affect the representation, otherwise another snapshot is necessary

• Can be deserialized from Teehistorian

Non-goals:

• repr(C) to serialize
• Implement functions on snap objects like trajectory.
• no_std
• Serialization can be played by old DDNet clients or Teeworlds Client
• resemblance of [i32; k] strings by Teeworlds
• writing non-DDNet snapshots (other mods)

Architecture:

• Using fixed to represent uniform scales for all distance related variables: 1 per tile
• vek for points
• arrayvec for stack strings/arrays
• rust enum for protocol enums
• bitflags
• bools
• One snapshot per team