Support multiple locations

[aaronczichon]

Description

As a user I may want to set multiple locations onto one image.

Implementation

Consider a new, additional syntax, for multiple coordinate which can show multiple locations on one rendered map image.

References

Maybe #18 should be done before this so that we can use array syntax as well for multiple locations.

[aaronczichon]

Consider using a new processing code block. For example we could use multi-locations.
This would help not messing up the different processing blocks and keeps the speed of the plugin.

Also with multiple processing blocks, consider adding a setting where support for one or another can be enabled/disabled if not needed.

[aaronczichon]

Implemented on feature/v2 branch.