Adding release notes for 2.3.1

release_notes/2.3.1.md

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+## New features:
+
+* \#34 One of the oldest feature requests finally done - there is a button to the top right to clear all filters at once
+* \#39 Added a combo box to the top right to select which sort order you prefer. The duplicate name search now does no longer force name sorting, because you 
+can now select it anyway.
+* \#234 Added a combo box below the patch grid to select the send mode. Auto is what was before, send sysex only if position in synth
+is not known. Now you can force it to always send sysex, or to always send only program change (which fails if no position known).
+* \#326 The About Dialog now contains a link to the homepage. 
+* \#327 Added missing test files for Python development to the Windows installer
+
+## Synths:
+
+* Yamaha reface CP: New adaptation contributed by @milnak. Many thanks!
+* Roland D50: Some progress made on the adaptation, but there are still some problems loading banks. Help appreciated!
+
+## Bug fixes:
+
+* \#322 Fixed migration problem for some old databases, most notably the database published with all the Ensoniq VFX patches.
+* \#325 Fixed rename of patch impossible if adaptation had implemented nameFromDump() but not renamePatch(). Now, when only nameFromDump() is 
+implemented any rename will change the name in the database, which overrides the stored patch name.
+* Updated link to JUCE documentation, as this is no longer with ROLI