Update Map specification

[nightm4re94]

<map>

• [ ] tiledversion: The Tiled version used to save the file (since Tiled 1.0.1). May be a date (for snapshot builds). (optional)
• [ ] class: The class of this map (since 1.9, defaults to “”).
• [ ] parallaxoriginx: X coordinate of the parallax origin in pixels (defaults to 0). (since 1.8)
• [ ] parallaxoriginy: Y coordinate of the parallax origin in pixels (defaults to 0). (since 1.8)

<editorsettings>

This element contains various editor-specific settings, which are generally not relevant when reading a map.

Can contain at most one: <chunksize>, <export>

<chunksize>

width: The width of chunks used for infinite maps (default to 16).

height: The width of chunks used for infinite maps (default to 16).

<export>

target: The last file this map was exported to.

format: The short name of the last format this map was exported as.