[RELEASE] cachemgm 4.0.0

[TASK] Adds Build status from travis to README.md
[BUGFIX] fixes path to sysext:lang language files in typo3v8
[TASK] removes TYPO3 V7 compatibility
[BUGFIX] CD-138015 Adjust table styling to match TYPO3 8
[!!!][TASK] Dropped Functionality, kept Caching Framework Information