Task #1: Restructure repository to work with Freeplane Gradle plugin
Task #4: Update add-on definition mind map to latest devtools version
Bug #3: Accelerator modifier not cross-platform
Bug #2: Execution of scripts freezes when opening node editor
Task #6: Remove obsolete line "// @CacheScriptContent(true)" from scripts
Bug #7: Issue can refer to a node that is not an issue, position or argument
Task #5: Document add-on in README.md