enable console prompts in settings

[w-e-w]

Description

add a UI settings under system for --enable-console-prompts
no reason why this should be restricted to a cmd arg

Screenshots/videos:

Checklist:

• I have read contributing wiki page
• I have performed a self-review of my own code
• My code follows the style guidelines
• My code passes tests

[AUTOMATIC1111]

should probably then remove the commandline option (or make it do nothing) because if the commandline option is on, the setting stops working.

[w-e-w]

I made it so that --enable-console-prompts is the default value of shared.opts.enable_console_prompts
this way old users that are using --enable-console-prompts will have this setting set to True
for normal users the default will be false

after they have applied / saved the setting, the value in settings will take precedence and --enable-console-prompts ignored

I think it's a good way of transiting between the settings
but this also has the downside of my causing some confusion for users that are using --enable-console-prompts now and then decide to not use it later on