Remove the constness of values returned by the API

[Paolo Brandoli]

The API returns some values as const, but they can be easily changed by the app using the API.

[Paolo Brandoli]

Addresses #360. Removed const qualifier from values returned by the API.

→ <<cset 13c12b698b77>>

[Paolo Brandoli]

Addresses #360. Updated changes log.

→ <<cset ca87fc444e90>>

[Paolo Brandoli]

Resolved in f7735223e1dd203221da7d7d46158e1d6c801ccc

[Paolo Brandoli]

Opening 6.0.0.0 Closes #159, #290, #326, #339, #340, #347, #350, #355, #357, #358, #359, #360, #361, #362, #363, #364, #366, #367, #368, #369, #370, #371, #372

→ <<cset 41c6182f3c2d>>