Some key points:
- Components and Plugins shouldn't extend Module directly
- Avatars should be fetched via GSActor ID, not by nickname as that isn't unique
- Avatar now is a separate Component
- Common file utilities are now to be placed in Core\GSFile, this will
handle storage and trigger validation
- Some bug fixes
This commit is a port from v2's 9a515b9234 ([SCHEMA] Improve timestamp storage) to v3.
As explained by Alexei Sorokin:
Avoid the use of deprecated MariaDATABASE "zero dates" globally. If they're present
as attribute defaults somewhere, they will be replaced with NULL implicitly.
The existing "zero dates" in MariaDATABASE storage will be left intact and this
should not present any issues.
The "timestamp" type in table definitions now corresponds to DATETIME in
MariaDATABASE with "DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP", which
should be close enough to the original behaviour for compatibility purposes.
It is now the recommended type for "modified" attributes, because of the
update trigger on MariaDATABASE. But there is no such trigger implemented on
PostgreSQL as of this moment.
