FR - Be able to write mod setting to file

I think it would offer an increased level of customization if the following was possible:
```
		{
			"Action": "WriteToFile",
			"TargetFile": "[Game]\\assets\\presentation\\pausemenu.lua",
			"Content": [
				{
					"Text": " UI_IncrementSparks( $MOD.spark-amount )",
					"StartOffset": 14436,
					"Replace": false
				}
			]
		}
```