Merge branch 'f-grpc-f-acm' into 'dev'

CHANGELOG.md

caosdb-proto

src/main/java/org/caosdb/datetime/DateTimeFactory2.java

src/main/java/org/caosdb/server/CaosDBServer.java

.../java/org/caosdb/server/accessControl/ACMPermissions.java

.../java/org/caosdb/server/accessControl/AnonymousRealm.java

.../org/caosdb/server/accessControl/AuthenticationUtils.java

...g/caosdb/server/accessControl/CaosDBAuthorizingRealm.java

...db/server/accessControl/CaosDBRolePermissionResolver.java

src/main/java/org/caosdb/server/accessControl/Principal.java

src/main/java/org/caosdb/server/accessControl/Role.java

...va/org/caosdb/server/accessControl/SessionTokenRealm.java

.../caosdb/server/accessControl/SinglePermissionSubject.java

...ain/java/org/caosdb/server/accessControl/UserSources.java

...n/java/org/caosdb/server/database/BackendTransaction.java

...atabase/backend/implementation/MySQL/MySQLDeleteRole.java

...er/database/backend/implementation/MySQL/MySQLHelper.java

...database/backend/implementation/MySQL/MySQLListRoles.java

...database/backend/implementation/MySQL/MySQLListUsers.java

...abase/backend/implementation/MySQL/MySQLLogUserVisit.java