* Add Insert Instant function in main window * Ensure selections and window geometry are saved in session file * Add wait cursor on session file save * Various improvements to display of texts in pane (clearer readability) * Use commands for setting properties on layers and panes (still need to batch up multiple sets on the same property) * Fix failure of spectrogram to refresh when initial part became visible * Some fixes & paint optimisations in View &c * Make curve mode for time value layers work properly when resolution == 1 * Some vague improvements for time value layer vertical scale