[sanny32]

Adds opt-in Enron Modbus support to the server settings. When enabled, requests use 32-bit registers at 5001–5999 (Int32) and 7001–7999 (Float32) over the existing TCP, RTU-over-TCP and serial RTU transports. The setting is saved with the project.

• Support 32-bit register payloads and logical register quantities for FC03, FC04, FC06, FC16 and FC23, with request-size and address-range validation.
• Show Enron register choices in data views and data maps only while support is enabled. Keep protocol addresses independent of ordinary address formatting, and allow display formats, byte order and word order to be selected separately.
• Preserve Enron selections in project/settings serialization, map consecutive requests correctly, and hide backing-word continuation rows in wider data displays.
• Log the Enron type, protocol address and logical register count when address spaces are added or removed.
• Update documentation, localized register names and the development version to 2.2.0.

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Validation: built the application and test targets with Qt 6.9.3 on macOS; all 33 CTest suites passed. Regression coverage includes protocol requests, transport framing, register choices, display formats, editing, persistence, filtering and address-space logging.

Closes #141.