removed unnecessary lines
fixed deprecated attribute
+ `fileIsValidBundle:` for validation of files
renamed method for more difference to fileIsValidBundle
updated version due to changes
Revert "updated version due to changes"

This reverts commit 4e9e2660a7f2e34b2fd6697beb2a2e7cd55895d5.
Revert "Revert "updated version due to changes""

This reverts commit d9d1307dfb8801fded17dc4dc2c79d720ffacee8.
Changes in implementation to comply to newest protocol version
removed deprecated code
Reverting weird changes to `Preferences.xib` that resulted in hiding various UI elements (fixed)
added macro for bundles subdirectory in resources directory
removed deprecated code
add plugins to the app via the GUI is now working! fixes #2 - at least temporarily. TBD: drag n drop on the button.