Release MK Slicer v3.10 (#1284)

+Snap Area: added an experimental option for pre-listening via MIDI input (from a Virtual MIDI Keyboard or an external MIDI controller).
+Sampler: The NoteOff option now affects MIDI preview, simulating the behavior of a sampler.
+Sampler: All rs5k instances are now created inside a Container.
+Sampler: added options for creating a track: create MIDI item only (as before), track with active recording/inputs only, and both options.
+Sampler: fixed default values for Attack and Release sliders.
+Theme: The maximum possible script window size limit has been increased.
+Theme: Added "Large Font Size" option (Options - User Settings (Advanced)), which increases the font size when the window size is large.
+Theme: Added two new themes. Spring - light and Fall (Dark) - dark.
+Theme: The appearance of the sliders has been changed, some sliders have become frameless. New elements have been added to the themes: Slider Background and CheckBox Body.
+Theme: The Random+Q bracket color has been added to themes for its correct display.
+Theme: Fixed Swing slider transparency bug.
+Fixed a bug: now the script does not close with an error when switching between Grid and Transients modes.
+Code cleaning (MIDI Sampler, visual elements).