V2.0.0-rc1

🆕 Add function for setting Device ID
🆕 Add Dark mode
⚠️ Restruct the Whole MQTT Structure (sorry... again! no major changes in future. promised!)
⚠️ Restruct the Json Structure
🛠️ Rewrite the whole data aquire now callback driven.
🐛 many bugfixes
🚀 improve Multi Device Support
🚀 improve Upgrade handler
🚀 Improve OTA Update, now ESP01 is possible when enugh space left
🛠️ rewrite the data handling on webUI
🛠️ Update Librarys