Refactor Numeral with new API
Fix Numeral#inspect and infinity name
New method Numeral#expand
Add support for approximate numerals
Method to convert approximate Numerals to exact Numerals
Method to check for zero Digits
Some Numeral fixes
Numeral rounding
Conversion classes to handle numeric type-specific behaviour
Missing from previous commit: main required file
Fix: Rounding#num_integral_digits did not handle numerals in different base
Rename Numeral#to_coefficient_scale to value_scale; add split method
Reader accessors for mode, base
Redefine Conversions interface, implement it for Float & Flt::Num
Some lint removal
Forgot to add these files to previous commit
Some convesion fixes
Add negation to Numeral
Allow creating a Rounding mode from a previous one changing some attribute
Integer & Rational conversions