Support double precision processing (#150) #249

Job	Run time
Build example plugins with CMake and JUCE 6.0.7 on ubuntu-latest	2m 41s
Build example plugins with CMake and JUCE 6.1.5 on ubuntu-latest	4m 59s
Build example plugins with CMake and JUCE 6.1.6 on ubuntu-latest	2m 55s
Build example plugins with CMake and JUCE 7.0.0 on ubuntu-latest	2m 51s
Build example plugins with CMake and JUCE 7.0.6 on ubuntu-latest	3m 19s
Build example plugins with CMake and JUCE 6.0.7 on windows-2019	5m 15s
Build example plugins with CMake and JUCE 6.1.5 on windows-2019	3m 6s
Build example plugins with CMake and JUCE 6.1.6 on windows-2019	3m 30s
Build example plugins with CMake and JUCE 7.0.0 on windows-2019	4m 23s
Build example plugins with CMake and JUCE 7.0.6 on windows-2019	3m 40s
Build example plugins with CMake and JUCE 6.0.7 on macOS-latest	1m 38s
Build example plugins with CMake and JUCE 6.1.5 on macOS-latest	1m 49s
Build example plugins with CMake and JUCE 6.1.6 on macOS-latest	4m 2s
Build example plugins with CMake and JUCE 7.0.0 on macOS-latest	2m 19s
Build example plugins with CMake and JUCE 7.0.6 on macOS-latest	1m 57s
	48m 24s

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