Autogenerate entire prime butterfly files, rather than just chunks #292

Job	Run time
Check and test WebAssembly with SIMD (stable)	1m 17s
Check+Test no features (stable)	42s
Check and test WebAssembly with SIMD (beta)	1m 25s
Check and test Linux arm 64bit with neon (stable)	1m 53s
Check+Test no features (beta)	40s
Check+Test default features (stable)	1m 25s
Check and test WebAssembly with SIMD (nightly)	1m 23s
Check and test Linux arm 64bit with neon (beta)	1m 52s
Check+Test no features (nightly)	39s
Check+Test default features (beta)	1m 26s
Check and test WebAssembly with SIMD (1.61)	1m 56s
Check and test Linux arm 64bit with neon (nightly)	1m 54s
Check+Test default features (nightly)	1m 27s
Check+Test no features (1.61)	1m 28s
Check and test Linux arm 64bit with neon (1.61)	2m 49s
Check+Test default features (1.61)	2m 24s
Check and test Linux x86 32bit	1m 45s
Rustfmt	18s
	26m 43s

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