Remove Markers' limit regarding Layers

[vhtr]

Hey,

Just a minor selfish wish:

Currently you can only create Markers on Layers (vertical levels on map) between -10 and +10, where 0 is usually the base for the world map. I'd like to have this limit removed, so I could create Markers on any Layer.

Why does it matter? Well it probably doesn't matter to most, but I like to use the verticality of Mmapper a lot. For things like towers and holes in the ground etc., where you might need to climb up or down. This isn't really an issue in those cases, but I especially like to put cities, towns, settlements, crypts, dungeons etc. small "instances" to their own dimension so to speak, out of sight. It is in my opinion less disorienting, than cascading locations on the edges of the world map, as is done in the popular maps (default, Wojtek, Nazgum).

But if the areas areas have even more movement down/up, I can't add Markers anymore, due to the limit.

[nschimme]

@vhtr how many layers do you need? 20? 30? (Some kind of limit is required to avoid corruption and users needing to hunt through 100+ layers to find the hidden mark)

[vhtr]

I think for my needs, if the limits were at -/+15, that should be enough!