When using older builds, prevent functions from being executed that do not work with this build.

[tnier01]

When using older builds (currently all before 0.5.6) there are severe restrictions on the use of the plugin, especially the display of ERC in the ERCGalley. To prevent this, with a build version not possible functions should be prevented. Currently there is only a corresponding note in the plugin settings.

Desirable especially for the future would be a corresponding blocking of functions that do not work with certain build versions, as soon as the corresponding version has been selected / activated by the user in the plugin settings.