V4.1.6: Bug fixes and cleanup

Changed

• Allow installations with oelib 5 (#1509)
• Allow a broader version range for dependencies (#1494)
• Run the tests with all warnings enabled (#1485, #1501)
• Rename the TSConfig folder to TsConfig (#1473)
• Loosen the mkforms/rn_base version requirements (#1469)
• Require oelib >= 4.1.8 (#1409, #1415)

Fixed

• Stop using removed oelib functionality (#1493, #1502, #1503, #1507)
• Bump the minimal 10.4 Extbase requirement (#1445)
• Only show the configuration check with a logged-in BE admin (#1427)
• Do not rely on transitive Composer dependencies (#1426)
• Fix a flaky test (#1403, #1408)
• Improve the type annotations (#1393, #1401, #1417, #1424, #1429, #1432)