Externalized the URLs to Subversion repositories.

This commit belongs to issue #345.
Added a feature for the data submission infrastructure.

This commit belongs to issue #346.
Externalized the credentials of mock participants.

This commit belongs to issue #345.
Renamed the data submitter feature.

This commit belongs to issue #346.
Duplicated RunningModes to break an unnecessary dependency.

This commit belongs to issue #346.
Skipped signing the JAR files.

This commit belongs to issue #347.
Change the message for wrong authentication information.

Removed the dead link from the message.

This commit belongs to issue #346.
Nested the submitter feature under the codingspectator feature.

This commit belongs to issue #346.