Local Project Management

[matt-attack]

Enable finding of projects stored throughout your computer. Based on idea from #18

Implementation of this would involve storing a list of projects built and their locations in a central location on the computer for the compiler to be able to find when searching for dependencies.
Currently, dependencies are specified as a path relative to the project requiring them. This will have to be changed somewhat. The initial idea is to search for projects in this list if no path delimiter is specified (/) and allow for a required version to be added after the project name.

Exact details on the version system and how to handle duplicates will have to be figured out in following issues. The main goal of this issue is the central database and being able to find packages with no version resolution.

[matt-attack]

Adding a way to navigate to projects on the system could be nice. Something similar to roscd could be very useful.