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

pom.xml

src/doc/conf.py

.../database/backend/transaction/DeleteEntityProperties.java

...rver/database/backend/transaction/DeleteSparseEntity.java

...er/database/backend/transaction/InsertEntityDatatype.java

...rver/database/backend/transaction/InsertSparseEntity.java

...in/java/org/caosdb/server/datatype/ReferenceDatatype.java

src/main/java/org/caosdb/server/entity/Entity.java

src/main/java/org/caosdb/server/entity/Message.java

...main/java/org/caosdb/server/entity/TransactionEntity.java

.../java/org/caosdb/server/entity/wrapper/EntityWrapper.java

...n/java/org/caosdb/server/grpc/CaosDBToGrpcConverters.java

src/main/java/org/caosdb/server/grpc/DownloadBuffer.java

.../org/caosdb/server/grpc/EntityTransactionServiceImpl.java

src/main/java/org/caosdb/server/grpc/FileDownload.java

...java/org/caosdb/server/grpc/FileDownloadRegistration.java

src/main/java/org/caosdb/server/grpc/FileTransmission.java

...a/org/caosdb/server/grpc/FileTransmissionServiceImpl.java

src/main/java/org/caosdb/server/grpc/FileUpload.java

...n/java/org/caosdb/server/grpc/FileUploadRegistration.java