Fix #202, Update LICENSE and copyright headers

[skliper]

Checklist (Please check before submitting)

• I reviewed the Contributing Guide.
• I signed and emailed the appropriate Contributor License agreement to GSFC-SoftwareRelease@mail.nasa.gov and copied cfs-program@lists.nasa.gov.

Describe the contribution

• Fix Add Apache 2.0 LICENSE file and update copyright headers #202

Testing performed
Documentation only, but built and ran unit tests anyways

make SIMULATION=native ENABLE_UNIT_TESTS=true OMIT_DEPRECATED=true BUILDTYPE=release install
make test

Expected behavior changes
None

System(s) tested on

• Hardware: i5/wsl
• OS: Ubuntu 18.04
• Versions: Bundle main + this commit (w/ GSFC apps added)

Additional context
None

Third party code
None

Contributor Info - All information REQUIRED for consideration of pull request
Jacob Hageman - NASA/GSFC