In loadExtensions(), the server now logs an error if an incompatible extension is found.

There is no need to check if the extension is compatible in initPlugins() anymore, because it will already have been done in loadExtensions(). Also update the warning message in initPlugins() to reflect this.

Updated the error message when an extension version is not compatible to indicate that the extension was not loaded, and that the user should install a compatible version.
Issue: MIRTH-2107
Fixed reference name to mcmanager.exe
Issue: MIRTH-1857