Make settings accesible from redmine

[yennor]

I'm pretty sure that you are aware of it and it's only a temporary solution but I mention it anyway ;-).
Since the settings are stored in the file models/constants.rb they will be overwritten on each update. Additionally they are a bit annoying to access there.
It would be great if we could change those settings directly out of redmine (that also would make them persistent).

[happy-se-life]

Next I'm thinking of solving this theme.