Implemented dynamic popup location

Created a function that will calculate the position of the popup
which is used on a SSHoverImageCell

issue A24Group/Triage#3518
Added missing changes.

This is the code that actually determines the location of the popup

issue A24Group/Triage#3518
Merge pull request #202 from Rynoh/hover-popup

Hover popup
Merge remote-tracking branch 'upstream/master' into textColumnSpacer
Added the code to customize the style for a header

issue: A24Group/Triage#3520