SpiceyPy 4.0.3

[4.0.3] - 2021-11-14

Added

• changelog now rendered in docs
• runtime override of cspice via env var or ld_library_path
• pyproject.toml and setup.cfg
• CSPICE N66 patches from NAIF/conda-forge feedstock
• builds for aarch64 and macos arm64

Changed

• switched to src layout
• switched "cspice.dll/.so" to "libcspice.dll/so"
• updated get_spice.py to build cspice from source
• moved most metadata to setup.cfg
• updated ci workflows to build wheels for major platforms using cibuildwheels
• updated install commands in docs to use pip instead of setup.py