Laspy

Changed
- Update minimum lazrs version which allows to:
- Fix Appending in LAZ files.
- Improve memory usage when reading/writing. (issue 152)

Fixed
- Fix `system_identifier` reading by ignoring non ascii characters instead of erroring ,(issue 148, PR 149).
- Fix `LasData.change_scaling` method.

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Fixed
- Fix `.min` `.max` methods of array views
- Ship the tests as part of the source distribution (But they won't be installed with `pip install`)

---

- Overhaul of the internals by essentially incorporating pylas into laspy,
while the API to retrieve and set dimensions stayed the same, other parts changed
and will require adaptation.
- Better LAZ support
* Added support for writing LAZ
* Changed decompression mechanism by using either `laszip` python bindings (and not laszip-cli)
or `lazrs`
- Added ability to read and write LAS/LAS in `stream` / `chunked` mode.
- Changed laspy to support the reading and writing of LAS/LAZ data from and to `file-objects` and `bytes`
- Dropped support for python2.7, python3.6+ is supported.

---

- Fixed bug in point record format 5, 9 and 10 [105](https://github.com/laspy/laspy/issues/105)
- Return explicit msg if laszip executable was not found [110](https://github.com/laspy/laspy/issues/110)
- Supprt numpy 1.17 [122](https://github.com/laspy/laspy/issues/122)

- Bug fix [92](https://github.com/laspy/laspy/issues/92)
- Test creation of all valid custom dimension data types
- Modify handling of extra bytes to be char data instead of numeric byte data

- Bug fixes [67](https://github.com/laspy/laspy/pull/67), [#75](https://github.com/laspy/laspy/pull/75), [b02b40900b5](https://github.com/laspy/laspy/commit/b02b40900b5620972930cd0c201b4db1a6a69754)
- Allow usage of `laszip-cli` when working with LAZ files [77](https://github.com/laspy/laspy/pull/77)