Remove Kolab backend from kronolith (issues disabled)

[ralflang]

All recent major versions of Kolab use incompatible technology and the Kolab backend driver should be removed from kronolith.

Note: This tracks Kolab removal for horde/kronolith which has GitHub issues disabled.

Components to Remove in horde/kronolith

Driver

• lib/Driver/Kolab.php - Complete Kolab calendar driver implementation
• lib/Event/Kolab.php - Kolab-specific event wrapper
• lib/Storage/Kolab.php - Kolab storage backend adapter
• lib/Calendars/Kolab.php - Calendar management via Kolab shares

Factory Support

• Remove Kolab driver handling from lib/Factory/Driver.php

Application Integration

• Remove Kolab share handling from lib/Kronolith.php

Configuration

• Remove "IMAP/Kolab" storage driver option from config/conf.xml (line 16)
• Remove Kolab free/busy configuration from config/conf.xml (lines 60-72)

Tests

• test/Kronolith/Integration/Kronolith/KolabTest.php
• test/Kronolith/Integration/Driver/KolabTest.php

Rationale

Similar to horde/Group#2, modern Kolab versions employ technology incompatible with the existing backend implementations. Kolab themselves advise integrating with Kolab using modern standards.

[ralflang]

Closed by kronolith@63ec729 and kronolith@5bb3c8ab