tiled

Would be nice to tell a user when certain things happen while processing, e.g. clamping values to their allowed maximum, enabling destination_only roads in 2. pass, deprecating request parameters etc.

IMO it should be a top-level warnings array of strings which is empty by default and all modules can add their share during processing: probably implement the most obvious ones first and add o

TilePix only supports orthogonal maps (currently - hopefully we'll be able to support other types in the future). A sensible error should be returned on Reading a map which doesn't have orientation="orthogonal".

Need to set up a constant for each type:

• orthogonal
• hexagonal
• isometric
• staggered

Then, using a switch statement, check against each, returning an error if not