Release v4.1.0

[New] Show Maintenance page even backend is open (https://github.com/nitsan-technologies/nitsan_maintenance/issues/7)
[Update] Make it compatible with TYPO3 10
[Fixed] Minor design changes for the image upload for TYPO3 10
[Fixed] Save maintenance TYPO3 8 issue (https://github.com/nitsan-technologies/nitsan_maintenance/issues/6)
[Improved] Improved Github & Gitlab CI for Automatic code review with lints (of PHP, YAML, TypoScript, Fluid, etc.)