H3

Added
- Area and haversine distance functions (377):
- `cellAreaRads2`
- `cellAreaKm2`
- `cellAreaM2`
- `pointDistRads`
- `pointDistKm`
- `pointDistM`
- `exactEdgeLengthRads`
- `exactEdgeLengthKm`
- `exactEdgeLengthM`
- Refactor `getH3UnidirectionalEdgeBoundary` for accuracy at small resolutions. (391)
- Speeds up `getH3UnidirectionalEdgeBoundary` by about 3x.
- Implement core logic for future vertex mode.
Fixed
- Fixed building the library with custom memory allocation functions on Mac OSX. (362)
- The installed H3 CMake target should have include directories specified. (381)
Changed
- Tests now use `bash` on Windows. (381)

Added
- `H3_MEMORY_PREFIX` CMake option for replacing the memory management functions used in H3. (317)
- Support for building Debian packages of H3. (352)
Fixed
- Removed duplicate include statements. (333)
- Fixed macro `H3_DIGIT_MASK_NEGATIVE`. (329)
Changed
- Again implement new `polyfill` algorithm. (313)

Fixed
- `compact` detects and fails on cases with duplicated input indexes. (299)
Changed
- `h3IsValid` returns false for indexes that have non-zero reserved bits. (300)
- `h3IsValid` and `h3UnidirectionalEdgeIsValid` return false for indexes with the high bit set. (300)

- Revert new `polyfill` algorithm until reported issues are fixed. (293)

Fixed
- `compact` handles zero length input correctly. (278)
- `bboxHexRadius` scaling factor adjusted to guarantee containment for `polyfill`. (279)
- `polyfill` new algorithm for up to 3x perf boost. (282)
- Fix CMake targets for KML generation. (285)

Added
- `h3ToCenterChild` function to find center child at given resolution (267)
- `getPentagonIndexes` (and `pentagonIndexCount`) function to find pentagons at given resolution (267)
Fixed
- Fix bounds check for local IJ coordinates (271)