Add Dynmap marker support to `genpoi` command

[trezy]

Currently genpoi just prints a bit of the data to the screen for copying into your Overviewer config. However, Dynmap has a similar format for it's marker files. We could easily write very similar data to Dynmaps markers file.

[JiFish]

Do you have a link to some documentation on Dynmap's maker format?

[trezy]

Unfortunately I haven't been able to find any docs but I can post an example from my own server shortly.

[sshipway]

There are several other mods that create markers -- for example, we use the voxelmap which makes a very easily-parsed file to add markers. Not sure how many of these should be supported...

However, an option to genpoi to create only the custom POI objects (and not the rest of the file) would be a good idea, so that multiple poi-generators could produce output to be concatenated.

[sshipway]

@trezy Beta Bukkit plugin to make Dynmap support MCDungeon natively: http://dev.bukkit.org/bukkit-plugins/dynmap-mcdungeon/

[sshipway]

Version 2.1 of dynmap-mcdungeon now supports the YAML-type dungeon cache files of the last few updates. This is available on dev.bukkit.org in the project area.