[v0.5.2] Cherry-picking licenses from development

[mprevide]

Changed license from GPL-3.0 to Apache-2.0

• Please check if the PR fulfills these requirements

• [ ] Tests for the changes have been added (for bug fixes / features)

• [ ] Docs have been added / updated (for bug fixes / features)

• What kind of change does this PR introduce? (Bug fix, feature, docs update, ...)

• What is the current behavior? (You can also link to an open issue here)

• What is the new behavior (if this is a feature change)?

• Does this PR introduce a breaking change? (What changes might users need to make in their application due to this PR?)

• Is there any issue related to this PR in other repository? (such as dojot/dojot)

dojot/dojot#1930

• Other information:

[codecov[bot]]

Codecov Report

Merging #175 (babc345) into release/v0.5.2 (b3dae46) will not change coverage. The diff coverage is 100.00%.

@@               Coverage Diff               @@
##           release/v0.5.2     #175   +/-   ##
===============================================
  Coverage           73.64%   73.64%           
===============================================
  Files                  17       17           
  Lines                1711     1711           
===============================================
  Hits                 1260     1260           
  Misses                451      451           

Impacted Files	Coverage Δ
DeviceManager/__init__.py	100.00% <100.00%> (ø)

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