Editor: fix mutexes issues (partially) - runnable application

[pavly-gerges]

This PR adds the following changes:

• [x] Refactor to runnable gradle application.
• [x] Untracked build files.
• [x] An attempt to stabilize the concurrent model.
• [x] Update gradle wrapper to 7.6.

[pavly-gerges]

In order to run this application, you have to download jdk-8, then use gradle wrapper:

└──╼ $./gradlew -Dorg.gradle.java.home=/opt/jdk1.8.0_202/ run

[pavly-gerges]

@icyboxs Could you test this PR to confirm the fix, please?