Make plugin versions more stable and document version alignment

[GGoetzelmann]

Currently multiple or all plugins rely directly on remote main branches of the scripts they are wrapping.

Building the same plugin version may therefore lead to changed plugin behaviour on script change.

Suggested changes:

• point to a stable version of the script, ideally a release tag
• base plugin version on script version and/or make version alignment transparent, for example by an alignment table:

plugin version	script version	API version
v0.3.1	v0.3.1	v1
v0.3.0	v0.3.0	v1

Edit: on further consideration: since the plugin has exactly one job - making the scripts applicable to use with the mapping-service - it should not have its own semantic versioning and only pass through the script version.