Closed binary update should triggger a minor version update.

[dominig]

Hello,

oeSENC is the type of plugin where the version is important as it may need changes once in a while.
I notice a change on closed source binaries on March 17th, followed by a Version Patch change but in OpenCPN only the version Major and Minor are reported, so a user who does not understand Git has no mean to know which version he runs.
It would be a good idea to update the minor even when only binary changes to let any user knows what he runs.

SET(VERSION_MAJOR "0")
SET(VERSION_MINOR "4")
-SET(VERSION_PATCH "1515")
+SET(VERSION_PATCH "1516")