Allow reading settings from specified file

[S-K-Tiger]

🚀 Feature Request

Is your feature request related to a problem? Please describe.

• Having used the plugin version for a while I noticed only a small number of the options available in said version are available for the client. (Disabling certain file types and all of the Terser options)

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Describe the solution you'd like

• A option to specify a json file that will be used to change default values. Command line arguments would override settings from the config.
• For instance:
  minifyall myFile.js -c path/to/config.json -m
  with config.json as:

"terserMinifyOptions": {
	"parse": {
		"bare_returns": true
	}
},
"disableHexadecimalShortener": false

• would have the parser support top level return statements but still minify the hexadecimal color values even if said config file said otherwise.

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Describe alternatives you've considered

• While having the options all added as cmd options like -m would work; this would make it harder to understand and work with.