DDF-705 - Converting Configuration Module to System Module.

Converting the Configuration Module to System. As there are changes planned for the modules down the road, the only change is visually for now.
Added the same 'plugin' framework that applications have to modules. Added System Info and Configuration page to the system module.
System Info has some information about the system.
Configuration is what was previously shown by the Configuration module.
+1 @mrmateo  great idea. I think collectively if we are going to give guidance we need to document it. Why keep making the same kind of comments on different pull requests? That does not help anybody. Documenting it and pointing people to guidance would be much more effective. If we need to discuss more at a DDF PMC meeting I'm certainly willing to do that.