editors/texmaker: Update to 6.0.1 [1]

Switch to qt6 [2]
Take maintainership [3]
Add LICENSE_FILE [4]
Rename icon files [5]

PR: 290912
Reported by: wen@ ([1], [2], [3])

		mew14930xvi@inbox.lv ([4], [5])

Approved by: maintainer(timeout, > 3 months)