Edit Static link ffmpeg & hide conflicting symbols

• Changes dynamic linking with ffmpeg libraries to static linking.
• Added symbol versioning to hide almost ALL symbols inside the built beamcoder.node file. The only symbol that is still public/global is napi_register_module_v1, which is the entry point of the node package. Doing so eliminates symbol conflicts between ffmpeg functions in beamcoder and ffmpeg functions in nwjs.
• Added libvpx to CI and to darwin builds

Remove segfault-handler

We temporary removed segfault-handler to simplify build

Initial release

Merge pull request #4 from Lumen5/add-ci

fix(*): fix github push

Initia release

Merge pull request #3 from Lumen5/add-ci

fix(*): .github folder

Initial release

Merge pull request #2 from Lumen5/add-ci

feat(*): add ci for beamcoder