Fixed issue #7 (only appearing on Windows).

Closes #7

See merge request !3

Bugfix/fix static tls import error

Closes #8

See merge request !2

Moved rasterio imports to function level to avoid static TLS conflict with pykdtree which is a dependency of pyresample.

Bugfix/fix etrs projection incompatibility

Closes #7

See merge request !1

Moved all pyresample imports to the top of the module to avoid Exception: dlopen: cannot load any more object with static TLS.

Moved all pyresample imports to methods to avoid Exception: dlopen: cannot load any more object with static TLS.

Fixed multiprocessing issue related to OpenMP multiprocessing within pykdtree as called by pyresample. Fixed type hints.

Fixed FutureWarning for numpy>1.16: arrays to stack must be passed as a "sequence" type such as list or tuple. Updated version info.