[BUGFIX] undeclared property $coreLoaded

The Variable should be declared as it seems to cause some problems if not.

Resolves: #35141
[BUGFIX] TYPO3Links throws fatal error in TYPO3 6

This is sort of a workaround that shall work for up to TYPO3 CMS 6.2

Resolves: #43441
[BUGFIX] use of require instead of require_once

May lead to some "cannot redeclare ..." errors

Resolves: #38837
[FEATURE] TYPO3 CMS 6.0.0 Support
[TASK] TER v0.9.0
[BUGFIX] typo in folder
[BUGFIX] foldertree for v6 thx to Witali Rott
[RELEASE] TER v0.9.2
[BUGFIX] fix TYPO3 CORE BUG #44440, as we have an xclass anyway
Merge branch 'master' of git://github.com/daKmoR/TYPO3-tinymce_rte