MIRTH-1985: Fixed bug where the Content-Type header was being sent for non-entity requests like GET/DELETE.
MIRTH-3452: The HTTP Sender now handles application/x-www-form-urlencoded the same for PUT requests as it does for POST requests.
MIRTH-2179: Disabled the multipart radio buttons when the application/x-www-form-urlencoded content type is used.
MIRTH-3404: Fixed bug that caused the "Drop OLD_CHANNEL" task to show up even if the OLD_MESSAGE table still exists. Since the OLD_MESSAGE table has a foreign key referencing the OLD_CHANNEL table, users should not have the option of dropping the latter until the former has already been dropped.
MIRTH-3453: Updated the indices for the Extension tasks since Check for Updates was removed. The correct tasks are now displayed when viewing the Extensions pane.