Support double precision processing #247

Job	Run time
Build example plugins with CMake and JUCE 6.0.7 on ubuntu-latest	4m 44s
Build example plugins with CMake and JUCE 6.1.5 on ubuntu-latest	2m 44s
Build example plugins with CMake and JUCE 6.1.6 on ubuntu-latest	2m 44s
Build example plugins with CMake and JUCE 7.0.0 on ubuntu-latest	2m 56s
Build example plugins with CMake and JUCE 7.0.6 on ubuntu-latest	3m 3s
Build example plugins with CMake and JUCE 6.0.7 on windows-2019	4m 53s
Build example plugins with CMake and JUCE 6.1.5 on windows-2019	3m 18s
Build example plugins with CMake and JUCE 6.1.6 on windows-2019	3m 19s
Build example plugins with CMake and JUCE 7.0.0 on windows-2019	3m 23s
Build example plugins with CMake and JUCE 7.0.6 on windows-2019	3m 57s
Build example plugins with CMake and JUCE 6.0.7 on macOS-latest	2m 5s
Build example plugins with CMake and JUCE 6.1.5 on macOS-latest	4m 1s
Build example plugins with CMake and JUCE 6.1.6 on macOS-latest	1m 47s
Build example plugins with CMake and JUCE 7.0.0 on macOS-latest	2m 1s
Build example plugins with CMake and JUCE 7.0.6 on macOS-latest	2m 3s
	46m 58s

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