Enhancements to version listing in dpm

[dasormeter]

Principles

• Should always show what is installed first
• Coloring is not sufficient to distinguish installed/uninstalled due to people who are color blind.
• Have a separate section that lists "Available versions to install"
• Order by semantic version

Out of scope

How to handle "active" version, particularly for the cases

• When running dpm outside of the context of a particular project
• When using DPM_SDK_VERSION env var override
• When there is no sdk version defined your project file

Possible Solutions

Listing of all installed versions (unchanged)

> dpm versions
   3.4.0-rc2
   3.4.7
 * 3.4.8

Listing of installed -- and available but not yet installed -- at once

> dpm versions --all
(installed)
   3.4.0-rc2
   3.4.7
 * 3.4.8

(available)
   3.4.4
   3.4.5
   3.4.6
   3.4.9