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 remote-tracking branch 'origin/hover-popup' into alecTextColumnCellChanges
Added functionality to optionaly show the popup

Added functionality to optionaly show the popup. Override the
"showPopup" function when creating an instance of the ssTextColumn.

If true is returned by "showPopup" then the popup will be displayed

issue A24Group/Triage#3522