Combined into one util class all utils that send requests to the Update Server, now known as Connect Service.
All requests made to Connect Service now send the server id and the server version.
Issues: MIRTH-3332, MIRTH-3378, MIRTH-3372
MIRTH-3432

The operation to retrieve the next message ID is now atomic for SQL Server, MySQL and Derby.

Sequences are now held in a D_MSQ[localChannelId] table for each channel and the D_MESSAGE_SEQUENCES table has been removed.

Selecting the next message ID now obtains an update lock on the sequence row, which will prevent two concurrent connections from selecting and updating the sequence value at the same time.

Separate sequence tables for each channel are necessary for SQL Server, since SQL Server may sometimes escalate a row lock to a page or table lock, even if the ROWLOCK hint is given. If that were to happen in a single, shared sequence table, one channel may block other channels and degrade performance.

Migration code has been added to migrate the old sequence values to the new sequence tables.

Additional utility functions were added to the Migrator class to assist with migrating the sequences. Notably, variable replacements can now be done in SQL scripts used for migrating the schema.
MIRTH-3433

Fixed deadlocks in SQL Server when multiple servers are updating message statistics for a channel.

The updateChannelStatistics and updateConnectorStatistics sql statements are now overridden for SQL Server in order to supply the TABLOCK hint to the query optimizer. This forces a table lock to be acquired when updating the message statistics, which prevents deadlocks from occurring in a shared database configuration.
MIRTH-3404: Modified the confirmation messages for the current database tasks.
MIRTH-1985: Fixed bug where the content type was being overridden for POST multipart messages.

MIRTH-3306: Fixed bug that caused content nodes within multipart XML to always be Base64 encoded, even if the content type doesn't match what's specified in the connector settings.
Changed the param name of server versions within Connect Service requests to the use the original param name.