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/CustomStandaloneFilterApp.cpp

@@ -1,28 +1,4 @@
-/*
-  ==============================================================================
-
-   This file is part of the JUCE library.
-   Copyright (c) 2017 - ROLI Ltd.
-
-   JUCE is an open source library subject to commercial or open-source
-   licensing.
-
-   By using JUCE, you agree to the terms of both the JUCE 5 End-User License
-   Agreement and JUCE 5 Privacy Policy (both updated and effective as of the
-   27th April 2017).
-
-   End User License Agreement: www.juce.com/juce-5-licence
-   Privacy Policy: www.juce.com/juce-5-privacy-policy
-
-   Or: You may also use this code under the terms of the GPL v3 (see
-   www.gnu.org/licenses).
-
-   JUCE IS PROVIDED "AS IS" WITHOUT ANY WARRANTY, AND ALL WARRANTIES, WHETHER
-   EXPRESSED OR IMPLIED, INCLUDING MERCHANTABILITY AND FITNESS FOR PURPOSE, ARE
-   DISCLAIMED.
-
-  ==============================================================================
-*/
+// SPDX-License-Identifier: GPLv3-or-later WITH Appstore-exception
 
 #include "../JuceLibraryCode/JuceHeader.h"