Publish JustyBase in Open Source Model

[KrzysztofDusko]

Probably still non free for big organisations (or somehow "limited" version).. But good enough for most "standard" users.

Phase 1 - free version starting point

• [ ] #326
• [ ] #327
• [ ] probably best idea is make superior support for Postgresql/MariaDB/MySQL ? -> https://github.com/KrzysztofDusko/JustyBase/issues/297
• [x] add warings about planned changes
• [ ] #330
• [ ] change licence to free right now - go to open sourcing won't be as easy as i thought before (many part of code must be refactored)

Phase 2

• [ ] good readme https://opensource.guide/starting-a-project/#writing-a-readme
• [x] code of conduct https://opensource.guide/starting-a-project/#establishing-a-code-of-conduct
• [x] contributing guidelines https://opensource.guide/starting-a-project/#writing-your-contributing-guidelines
• [ ] more readable code
• [ ] comments cleanup
• [ ] code must be separated from the pro version (thera are many conditional compilation block codes ...) - common part can be in library od shared project. More base class can be also used
• [x] licence specific code also must be removed
• [ ] open source license selection - licence should be liberal like MIT ? Similalr great project uses GPL - OneBella. Or maybe something like that https://polyformproject.org/licenses/noncommercial/1.0.0/ ?
• [ ] Support for AOT also seems reasonable - startup time + no .net dependency -> https://github.com/sourcegit-scm/sourcegit