Autogenerate entire prime butterfly files, rather than just chunks #294

Job	Run time
Check and test Linux arm 64bit with neon (stable)	1m 10s
Check and test WebAssembly with SIMD (stable)	1m 17s
Check+Test default features (stable)	1m 23s
Check+Test no features (stable)	40s
Check+Test default features (beta)	1m 27s
Check+Test no features (beta)	39s
Check and test Linux arm 64bit with neon (beta)	1m 10s
Check and test WebAssembly with SIMD (beta)	1m 24s
Check+Test default features (nightly)	1m 27s
Check+Test no features (nightly)	41s
Check and test Linux arm 64bit with neon (nightly)	1m 9s
Check and test WebAssembly with SIMD (nightly)	1m 21s
Check+Test default features (1.61)	2m 28s
Check+Test no features (1.61)	1m 28s
Check and test Linux arm 64bit with neon (1.61)	1m 28s
Check and test WebAssembly with SIMD (1.61)	1m 53s
Check and test Linux x86 32bit	1m 39s
Rustfmt	10s
	22m 54s

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