Allow user to specify a commit message to be used

[fdellwing]

Describe what problem your feature request solves:
"Created by OWASP Threat Dragon" and "Updated by OWASP Threat Dragon" are fine for playing around, but are not enough for a real production use.

Describe the solution you'd like:
I would like to be able to write a commit message myself while saving changes in TD. The feature should be disabled by default but has 2 modi if activated via ENV: enabled (you can write your own message) and forced (you have to write your own message).

[jgadsden]

this is a good suggestion @fdellwing , are you able to provide the implementation? I can assign it to you if you like

[fdellwing]

I have no idea where I would even start with that. Like, I know where these strings are hardcoded. But I have no idea how to create a popup message field or pass the content around. I'm not a developer and even less a JS developer.