Refactor server Engine configuration setup

[thejcpalma]

Update Engine Configuration Setup

Summary

This pull request introduces new configuration modes for the Engine.ini file, providing more flexibility and control over how engine settings are configured.

Motivation and Context

With the evolving needs of the project, it became essential to enhance the configuration options for the Engine.ini file. The addition of three modes (full, modular, and skip) allows users to tailor the configuration process to their specific requirements when SERVER_SETTINGS_MODE is set to auto.

Description

The ENGINE_CONFIG_MODE environment variable now plays a crucial role in determining how the engine settings are configured:

• full: Includes all settings in the Engine.ini.template file, utilizing environment variables or default values.
• modular: Configures settings in the engine file only when the corresponding environment variable is set and not empty.
• skip: Always skips the configuration of settings in the engine file, regardless of SERVER_SETTINGS_MODE being set to auto.

The following table summarizes the key variables:

Variable	Description	Default value	Allowed value
ENGINE_CONFIG_MODE	How Engine.ini file is configured	modular	full/modular/skip

Testing Instructions

To test these changes:

1. Set SERVER_SETTINGS_MODE to auto.
2. Adjust ENGINE_CONFIG_MODE to full, modular, or skip.
3. Configure individual environment variables related to engine settings.
4. Run the server and verify that the Engine.ini file reflects the chosen configuration mode and settings.

Checklist

• I have performed a self-review of my own code
• I have updated the documentation (if necessary)
• My changes do not introduce any breaking changes or bugs