HPKE API:

- improved exposed server actions' descriptions;

HPKE demo:

- improved the labels on the .oap file demo (had misleading labels, making the impression the logic was all wrong);

HPKE API:

- improved code programming readability and better compliance with C# style guides;

HPKE demo:

- updated references for the new API version;

- Fixed some demo imagery bugs;

- Added text demo;