Fix OAuth and Realtime issues introduced in 9a515b9234eeb2e500e88899fb31f64535b618cc
[DATABASE] Fix an empty default value mistake introduced in
fde929b151f2b286cb60d226c47570209199c9c5
[DATABASE][PostgreSQL] Avoid use of pg_constraint.consrc, which was removed in
PostgreSQL 12.
[DATABASE][MariaDB] Fix a typo introduced in aed2344bd4c512dae48d1a5bd2eda218f914ae11
[DAEMON] Wrap an assignment inside "switch":
a follow-up to adc689cb15d611c83ebb9c5aaeaa1008ec14da28
lib/plugin.php now has a parent onAutoload function that finds most common
files that are used in plugins (actions, dataobjects, forms, libs etc.) if
they are put in the standardised directories ('actions', 'classes', 'forms',
'lib' and perhaps some others in the future).