Add optimized (smaller) lookup table for float type parsing#103

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jrahlf wants to merge 2 commits intofastfloat:mainfrom

jrahlf:optimized_float_table

Commits on Sep 12, 2021

use float lookup table if parsing as float. Add two new example test files to test/benchmark code sizes. Add script to generate float lookup table.
jrahlf
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add missing typename for older c++ versions/compiler, rename type to parsing_type
jrahlf
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