Need for overriding default API level #459
Description
After merging OpenCPN/OpenCPN#4867 the declared metadata API level has new functionality. The basic thing made possible by the PR is to make it possible for a plugin which uses for example api-22 functions (opencpn 5.16) to be loaded on a api-21 host. The plugin then can determine if the host supports api-22 and act accordingly.
Practically, this means that a plugin using api-22 should be able to configure the required api level to be api-21, overriding the default api-22 which comes with including opencpn-libs/api-22.
No hurry, this will not be useful until we are building plugins for 5.16 during autumn -27. It might also need updates to opencpn-libs/api-22 when it comes in place.