* [UI,FIX] Removed `layout` ID that would cause the menu to become vertical.
* [UI,FIX] Centering of simulation speed indicator on a separate line.
* [UI,FIX] Removed unused white space to the left of the graph.
* [UI,SC] Improved layout of data pane.
* [UI,EXT] Confirming the data pane (i.e. generating a graph) automatically closes the pane.
* [SC] Simplified styling of file button.