Introducing Devshell: like virtualenv, for every language

STATUS: unstable

It should not take more than 10 minutes from the time you clone a repo and canstart contributing.

Unfortunately, an unbounded amount of time is usually spent installing builddependencies on the system. If you are lucky, it's a pure $LANG project andall it takes is to install that language and its dedicated package manager. Onbigger projects it's quite common to need more than one language to beinstalled. The side-effect of that is that it creates silos withing companies,and less contributors in the open-source world.

It should be possible to run a single command that loads and makes thosedependencies available to the developer.

And it should keep the scope of these dependencies at the project level, justlike virtualenv.

These are the goals of this project.