Update build system and add github CI tests

What's Changed

• Update build system by @tskisner in #2

Full Changelog: 1.0.9...1.1.0

Install static library with a different name

This allows easy static linking by downstream software.

Fix build system for shared library

1.0.8

Cmake does not support bundling convenience libraries within a shared…

Use cmake SHARED instead of MODULE

1.0.7

Use cmake SHARED rather than MODULE.

Separate build of internal library from the loadable shared library

1.0.6

Build an internal library and use that for building all the test util…

Fix for Visual C++ cmath missing round()

1.0.5

Under some compilers, cmath headers do not include the round() functi…

Fix an upstream bug

1.0.4

Fix what seems to be an upstream bug caused by a misplaced parenthesis.

Build shared libraries

1.0.3

Ensure we always build a shared library.

Small fix for some versions of Visual C++

1.0.2

Explicit typecast to unsigned long to int in calls to pow() to avoid …

Ensure tests pass on Windows

1.0.1

On Windows, disable tests that require file reads.