Add release notes for upcoming 2.4.0 release

release_notes/2.4.0.md

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+## New features:
+
+* \#334 **Auto fill new lists and banks**: When creating a list or a new user bank, you know have the option to autofill the list
+with patches from the currently selected search. E.g. you can easily make a list of your current favorite OB-6 basses by
+setting up a filter and then clicking "add new list" and select auto fill with top hits. Or you can create a new user bank
+with a random selection of all patches marked as "Lead", and subsequently send this into the synth.
+* The selected **send mode is now persisted** across program runs, and specific for each synth. So you can e.g. select
+edit buffer to always get the correct patch when sending to a synth with small edit buffers, and automatic to prefer program 
+change messages for slow synths like the Hydrasynth. If you always only want to send program change, select that send mode and 
+make sure the synths of the banks are imported so KnobKraft knows which patch is where in the synth.
+
+## Synths:
+
+* **Yamaha reface DX** \#324 had indicated a potential wrong impementation of the checksum, which did not seem to be effective but 
+I changed the implementation anyway. 
+
+## Bug fixes:
+
+* \#333 was a bug that was preventing the program change send mode to work properly with the reface DX and other synths.
+* Fixed crash on exit which happened sometimes when MIDI messages were still being received duing shutdown.