Allow for Out of Source building

[mwasplund]

Is your feature request related to a problem? Please describe. The default location of a build should probably remain inside the package folder in a single "out" folder, however building inside the source tree is not best practice. Ideally we should be able to specify a root folder to place all of the build output.

Describe the solution you'd like One solution would be to use directory config files that are used by the CLI to look for a root directory specification for all projects under that folder. Otherwise a user config could override it for an entire user account, or a exe config could override it for the installation on a given machine.