Display the current version of SilverStripe and/or CWP

[be2n]

As a Product Owner
I want to be able to access the version of SilverStripe CMS and CWP my site uses
So that I can make more informed decisions about product investment

Acceptance criteria

• The version of the SilverStripe CMS is displayed
• (CWP only) The version of the main CWP recipe used is displayed
  • In both CWP versions, the cwp/cwp-core module (only mandatory requirement) can be used to determine this
• Versions are displayed in the summary section of the report

Notes

This information is already available by hovering over the SilverStripe logo in the top left corner (may currently be broken for CWP) - the backend for this can be re-used.

Designs: https://projects.invisionapp.com/share/ASGU6A7RT8U#/screens/291050684

[robbieaverill]

@ScopeyNZ see @clarkepaul's comment here:

From memory there is a Gridfield header which normally sits under the actions (above gridfield), if true then perhaps the Version details should become the header.

[clarkepaul]

Bet me to it :)