eliminate compiler warnings
scripting api: add node.icons.clear() like node.attributes.clear()
preliminary scripting api for exports
Merge remote-tracking branch 'origin/master'
improving error message
fixed for/with headless mode
java version compatibility
improved null safety
refactoring
scripting API for encrypted nodes
refactored EncryptionController to remove direct Swing references
Merge branch 'master' of github.com:freeplane/freeplane
scripting API for export was added too