Add bias to `Snapshot` and Use in `ImportedSource` #136

Job	Run time
Build using Intel oneAPI on Ubuntu	3m 27s
Build using MinGW-64 on Windows	5m 51s
Build using Clang on macOS	1m 29s
Build using GCC on Ubuntu	2m 52s
Build using MSVC on Windows	4m 6s
	17m 45s

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