de-vendor gtest and bump to 1.15.2 (#13)

* de-vendor gtest and bump to 1.15.2

* support building against 2.8 too

* put back StageWrapper usage – require PDAL 2.9.2 for passing test

* bump ci

* remove carriage returns when comparing strings for tests

* typo fix

* use replaceAll from PDAL

* try different replacement

* explicitly remove \r's

bump for 1.6.5

bump to 1.6.4 for broken auto-release

fix release CI

Numpy 2.1+ support (#11)

* pin to numpy < 2.1

* no 3.13 yet

* set numpy 2.0 pin

* numpy1

* restructure defines and undef NPY_API_SYMBOL_ATTRIBUTE

* undo pin

* parameterize numpy

* doh

* exclude 2.1 for python 3.9

* use _import_array as before for numpy 1.x

* cleanup and fix osx flat_namespace thing

* put back NPY_API_SYMBOL_ATTRIBUTE

* set min CMake version to 3.13

* bump ver to 1.6.2

bump for 1.6.1 proper release

ABI compat

fixes for numpy 1.22+

set NPY_1_22_API_VERSION (#8)

* set NPY_1_22_API_VERSION

* fix URL

proper version