Add hook-in for plugin to report that a preset has been loaded #233

Job	Run time
Build example plugins with CMake and JUCE 6.0.7 on ubuntu-latest	2m 40s
Build example plugins with CMake and JUCE 6.1.5 on ubuntu-latest	3m 6s
Build example plugins with CMake and JUCE 6.1.6 on ubuntu-latest	2m 54s
Build example plugins with CMake and JUCE 7.0.0 on ubuntu-latest	2m 38s
Build example plugins with CMake and JUCE 7.0.6 on ubuntu-latest	3m 52s
Build example plugins with CMake and JUCE 6.0.7 on windows-2019	2m 59s
Build example plugins with CMake and JUCE 6.1.5 on windows-2019	3m 23s
Build example plugins with CMake and JUCE 6.1.6 on windows-2019	3m 31s
Build example plugins with CMake and JUCE 7.0.0 on windows-2019	3m 26s
Build example plugins with CMake and JUCE 7.0.6 on windows-2019	3m 43s
Build example plugins with CMake and JUCE 6.0.7 on macOS-latest	3m 31s
Build example plugins with CMake and JUCE 6.1.5 on macOS-latest	6m 14s
Build example plugins with CMake and JUCE 6.1.6 on macOS-latest	4m 56s
Build example plugins with CMake and JUCE 7.0.0 on macOS-latest	4m 36s
Build example plugins with CMake and JUCE 7.0.6 on macOS-latest	5m 56s
	57m 25s

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