Autogenerate entire prime butterfly files, rather than just chunks #295

Job	Run time
Check and test Linux arm 64bit with neon (stable)	1m 50s
Check+Test default features (stable)	1m 26s
Check+Test default features (beta)	1m 29s
Check and test WebAssembly with SIMD (stable)	1m 15s
Check and test Linux arm 64bit with neon (beta)	1m 53s
Check+Test default features (nightly)	1m 25s
Check+Test no features (stable)	41s
Check and test WebAssembly with SIMD (beta)	1m 20s
Check and test Linux arm 64bit with neon (nightly)	1m 49s
Check+Test default features (1.61)	2m 24s
Check and test WebAssembly with SIMD (nightly)	1m 20s
Check+Test no features (beta)	39s
Check and test Linux arm 64bit with neon (1.61)	2m 46s
Check and test WebAssembly with SIMD (1.61)	1m 52s
Check+Test no features (nightly)	40s
Check and test Linux x86 32bit	2m 8s
Check+Test no features (1.61)	1m 28s
Rustfmt	11s
	26m 36s

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