Remove PKG-INFO, .appveyor.yml & tox.ini, update MANIFEST.in

Author: gsakkis

.appveyor.yml

@@ -1,11 +1,8 @@
 exclude MANIFEST.in
-include CHANGES.txt README.rst pyproject.toml tox.ini CMakeLists.txt
-include pdal/*.txt
-include pdal/*.cmake
-include test/*
+include LICENSE.txt CHANGES.txt README.rst pyproject.toml CMakeLists.txt pdal/CMakeLists.txt
+include test/*py
+include test/data/*
 
 recursive-include pdal/test *
-recursive-include test *
-recursive-include pdal *.pyx
 recursive-include pdal *.hpp
 recursive-include pdal *.cpp