Various items before 1.5.1

- fixed passthrough when capturing
 - added declicking fades when bypassing input passthrough, playback, and recording
 - layout tweaks for extra small windows
 - waveform scrollbar improvements, visible edge drag handles, and allows dragging from anywhere
 - minor visual tweaks
 - license header mods, and LICENSE file consolidation

Source/PS_Source/StretchSource.cpp

@@ -1,19 +1,6 @@
-/*
-
-Copyright (C) 2017 Xenakios
-
-This program is free software; you can redistribute it and/or modify
-it under the terms of version 3 of the GNU General Public License
-as published by the Free Software Foundation.
-
-This program is distributed in the hope that it will be useful,
-but WITHOUT ANY WARRANTY; without even the implied warranty of
-MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-GNU General Public License (version 3) for more details.
-
-www.gnu.org/licenses
-
-*/
+// SPDX-License-Identifier: GPLv3-or-later WITH Appstore-exception
+// Copyright (C) 2017 Xenakios
+// Copyright (C) 2022 Jesse Chappell
 
 
 #include "StretchSource.h"