#99: Add stylesheet.
#99: Use the style sheets in the FXML layout files.
#99: Set notification pane UI to dark.
Merge branch 'emmeryn-#99-ui-revamp' into emmeryn-#96-show-priority
#96: CSS styles for priority colour
#96: Factory to display the colours for each task in the table.
#96: Use the task priority factory to display colours accordingly.
#99: Increase the width of the ID and task done columns
Merge branch 'emmeryn-#99-ui-revamp' into emmeryn-#96-show-priority