Forum Release Management: chat (changes between 5.10.0 and 5.10.1)

Changes in the chat package between OpenACS 5.10.0 and 5.10.1

Anonymous chat participants (3a73986c, 214684f3): use newly introduced support for anonymous users built in xowiki to support not logged-in users
Chat include (c2ab5967) : Move the main chat rendering in an include to allow reuse in other contexts

Fix typo in datamodel code affecting new installations (98d26cfa)
Improve/fix Oracle compatibility (d3e0d69b, cb2e52d0, 04e229f2)
Allow for arbitrary arguments to be passed when extending inherited methods (95ca0c0e)
Allow to persist chat messages also in the chat sweeper (4bf7bd59)

Performance Improvements
- (Postgres only) Improve performances when fetching the available chat rooms using recursive permission api (56d47b31, 0b2cff50)
Security Improvements
- Improve SQL quoting (e2146673)
- Harden page contracts and use new contract features from the core (43955d16, 148be6f4, 7f6b5c92)
Code Refactoring
- Replace :xo::clusterwide -> ::acs::clusterwide for cluster-aware chaching (76fbfe1f)
- Replace ::xo::db::sql -> ::acs::dc as tcl abstraction for db stored procedures (76fbfe1f)
- Replace deprecated api (928793ce, cb2e52d0)
- Replace handcrafted HTML icons with new adp:icon adp tag (054c46cc)
- Reduce layers of redirection when accessing a chat room (4f57e272)
Miscellaneous
- Prefer message keys from core packages (943daaa3)
- Cleanup vestigial features/dead code (23fe7d3a, b8d5da6d, d7434cae)
- Pass properties to master template as literal according to best practices (98a2b1ec)
- Extend test suite to 100% public API coverage (117c66e3, 210e3f16, b2abc81c, fe60e3d1)
- Improve configurability and styling of the chat includelet (54bb236f, 289ddee6)
- Streamline idioms (2b0bd209)
- Replace legacy message keys (a465cf76)
- Improve localization (0252ed50)