[core][idea] Allow selecting which fields will be overwritten by the plugin

[jokob-sk]

          Thanks for explaining this. I'm not sure if Asus has a write API but I also cannot find anything like this in the library I am using. Anyway I think it would be more than I am currently motivated to work on :-) With the DB as I expected running SQL directly is risky, but that was just an idea do discuss.

I like the idea with giving a list of columns that plugin can update. I suppose a field like this could be as simple as adding its definition to plugins config.json same as it is done with others.
Anyway to me what was most important was to import devices from the Router as it is 100% correct list of devices I was interested to see in NAX and now I am fully able to use this tool the way I needed. Maybe some day you can consider expanding the plugins capabilities but I don't want to push it as it is really not a necessity for me right now. Thanks for merging the plugin.

Originally posted by @labmonkey in #958 (comment)