v1.0.0

This fork is rebranded from Number/:number to NumberFormatter/:number_formatter,
published as a new Hex package (number_formatter), so versioning restarts at 1.0.0
rather than continuing upstream's 1.0.x line. Everything below is relative to
upstream v1.0.5.

Breaking changes:

• Renamed every module (Number -> NumberFormatter) and their backing files
  (lib/number(.ex|/) -> lib/number_formatter(.ex|/), same under test/).
• Renamed the OTP application/config atom from :number to :number_formatter.
  Existing config :number, ... must become config :number_formatter, ....
• Package renamed from number to number_formatter; repo moved to
  Ch4s3/number_formatter.
• Upgraded decimal to ~> 3.0, dropping support for ~> 1.5/~> 2.0.
• Tightened the elixir version requirement from ~> 1.0 to ~> 1.16, matching
  what's actually tested in CI.

Added:

• Elixir 1.20 support, tested in CI alongside 1.16.
• CI migrated from Semaphore to GitHub Actions.
• Credo static analysis, run as part of bin/test.
• Test coverage for the use NumberFormatter macro (previously untested).

Fixed:

• Conversion.to_float/1 and to_decimal/1 no longer silently truncate
  malformed strings with a valid numeric prefix -- to_decimal("123abc")
  used to return Decimal.new(123); it now raises ArgumentError.
• Fixed a Decimal.Error crash in number_to_delimited/2 and
  number_to_currency/2 on float-derived strings with more than 28
  significant digits (Decimal 3.x's default max_digits).
• Fixed backreference corruption in Currency.number_to_currency/2 and
  Phone.number_to_phone/2 when a :unit or :delimiter option contained a
  literal backslash-digit sequence (e.g. "\1"), which was silently misread
  as a regex capture-group reference.
• Fixed Elixir 1.19+ deprecation warnings (preferred_cli_env -> cli/0,
  single-quoted charlists -> ~c sigil).

Changed:

• Removed the dead Decimal 1.x compare/2 compatibility shim; call sites now
  use Decimal.compare/2 directly.
• Simplified Human.number_to_human/2 (cyclomatic complexity 11 -> a
  data-driven scale list) and Delimit.to_integer/1 (explicit try ->
  idiomatic implicit try).
• Extracted repeated config-loading boilerplate (5 modules) into
  NumberFormatter.Config.resolve/2.