lox-orbits-v0.1.0-alpha.21

Added

• (lox-orbits) add new Orbit types
• (lox-time) add attosecond-resolution deltas
• (lox-derive) implement OffsetProvider derive macro
• add lox-test-utils crate and refine EOP parser interface
• (lox-earth) implement new EOP parser and data provider

Fixed

• (lox-orbits) fix floating point issue in LOS calculation
• fix formatting and use stable rustfmt

Other

• move lox-units code to lox-core
• (lox-units) restructure constants to match std
• add 3rd-party data licenses
• update SPDX headers and add helper script
• make Lox REUSE-compliant
• get rid of float_eq and lox_math::is_close
• (lox-units) make Angle value private
• (lox-bodies/lox-earth) anglify lox-bodies and lox-earth
• start reimplementation of frame transformations
• move type aliases to lox-units
• refactor all the things
• (lox-time) use provider pattern
• (lox-units/lox-math) move constants to lox-units