[Feature Request] Add "Startup command line" option to settings panel

As per request, splitted. And thanks for the information on the other issue. :+1:

The request: Since there are a great many switches for the "startup command line" it would be very useful to get an option added to settings (I know not recommended, but I wouldn't know where else to put it) a la CentBrowser (startup command options are stored in an .ini file which is read/called at startup), in Windows you only get so many characters to add to the "Target" field (I believe 255?) before you run out, which in Chromiums case happens very fast. Since CentBrowser doesn't open source their build of Chromium I cannot link to anything.

These are the switches I currently use: " --user-data-dir=".\Profile" --disable-breakpad --disable-logging --disable-sync --disable-speech-api --disable-voice-input --disable-domain-reliability" That fills it almost up so that I for example can't add the option "--show-avatar-button never" to it.