Introduce single line / single pattern evaluation for tidal-listener

[ndr-brt]

As stated here: https://club.tidalcycles.org/t/the-atom-plugin-thread/2244/84?u=ndr_brt

No shift-enter, everything is treated as a multi-line pattern so need blank lines between everything. Ok, a good habit to get into anyway All patterns are sent every time *-enter is pressed, not just the pattern you're editing. No beginning to edit a pattern then make a quick change to another one and go back to the other to finish editing.