Ladkit utilities for system maintenance

com_ladkit (component) - Version 4.10

Changes

Modified the manifest XML to work with new Remository update service (3.05)
Removed support for Joomla 3, checked OK for Joomla 6 (4.00)
Changed links to no longer available Les Arbres Design web resources. Linked to new manual. (4.10)

com_ladkit (component) - Version 4.20

Changes

Modified DB manager to avoid using SHOW DATABASES which user may not have permission for (4.20)
Incorporated newer version of phpminiadmin (4.20)