Allow user to select location of the old content folder during upgrade installation on Windows

[radinamatic]

@MCGallaspy is implementing the steps to find content folder of the previous installation and move it (if necessary) to the new location during the upgrade to 0.16 (PR #335). In case installer is unable to find the location of the content folder for the previous version automatically, the following step would be to allow users to browse and select the old-version content folder themselves. Suggested wording:

KA Lite Setup is unable to locate the content folder of your previous installation 
in order to perform the upgrade to current version. Please select the ".kalite/content/" 
folder on your computer and press the button "Continue" to finish the upgrade process. 

There should, of course, be a field for a path and a Browse button in there too... 😉

[benjaoming]

@radinamatic did this ever get implemented?

[radinamatic]

No, not that I recall @benjaoming!