Bumps version to v0.7.0-beta1 #171

Job	Run time
Build and Test (windows-latest) / Build and Test	1m 59s
Build and Test (ubuntu-latest) / Build and Test	1m 10s
Build and Test (macOS-latest) / Build and Test	1m 32s
Push Packages / Push Packages	1m 7s
	5m 48s

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