BigInt Fixes for Issues in Violet Tests#262

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mgriebling wants to merge 7 commits intoapple:bigintegerfrom

mgriebling:biginteger

Commits on Apr 18, 2023

Added improved LosslessStringConvertible init() with order of magnitude faster performance.
mgriebling
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Commits on Apr 19, 2023

Fixed a negate() corner case issue where a negative integer was turned into a negative.
mgriebling
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Fixes issue with FloatingPoint overflow and other integer test overflows.
mgriebling
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Fix corner-case overflow with Int.min and -1 division.
mgriebling
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Commits on Apr 20, 2023

Added new CustomStringConvertible implementation (20X to 70X faster than the default).
mgriebling
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Commits on Apr 22, 2023

New implementation for LosslessStringConvertible init?(); speeds conversions by 35X to 310X times over original code.
mgriebling
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Commits on Apr 27, 2023

Removed Foundation import from BigInt.
mgriebling
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