Attributs GH PR #936: https://github.com/ArcticaProject/nx-libs/pull/936

Signed-off-by: Mario Trangoni <mjtrangoni@gmail.com>

Attributs GH PR #930: https://github.com/ArcticaProject/nx-libs/pull/930

Attributes ArcticaProject/nx-libs#241

No functional changes, just clarification/explanation of the existing
code.

Fixes ArcticaProject/nx-libs#926

Attributes GH PR #931: https://github.com/ArcticaProject/nx-libs/pull/931

was previously undocumented.

Fixes ArcticaProject/nx-libs#796

Fixes ArcticaProject/nx-libs#241
Fixes ArcticaProject/nx-libs#495
Fixes ArcticaProject/nx-libs#535
Fixes ArcticaProject/nx-libs#565

Attributes GH PR #934: https://github.com/ArcticaProject/nx-libs/pull/934

Attributes GH PR #918: https://github.com/ArcticaProject/nx-libs/pull/918

instead of sendSelectionNotifyEventToClient + setClientSelectionStage

Moving the client check to sendSelectionNotifyEventToClient enables us
to drop notifyConvertFailure.

and reset the lastClient variables when stage is set to None.

resolve lastClientClientPtr to process id and process name

Attributes GH PR #927: https://github.com/ArcticaProject/nx-libs/pull/927

In commit f48e2da3 I marked NX changes
by using #ifdef NXAGENT_SERVER. But I had missed that this define was
never set in mi. So let's change that now and make it work like
before.

Fixes ArcticaProject/nx-libs#926

Attributes GH PR #924: https://github.com/ArcticaProject/nx-libs/pull/924

Run newer compilers in Ubuntu Bionic 18.04.

Also update gcc from v9.x to v10.x, and clang from v8.x to 9.x

Fix some syntax changes in TravisCI configuration.
Signed-off-by: Mario Trangoni <mjtrangoni@gmail.com>

Attributes GH PR #896: https://github.com/ArcticaProject/nx-libs/pull/896