source: make multiple derived classes final

Multiple derived classes were using virtual functions in their
ctor/dtor. For this to work reliably we declare the classes final, to
not produce complex construct/destruct scenarios if someone where to
derive from these classes.

Signed-off-by: Jan Kraemer <jan.kraemer@vector.com>

Author: VJanKraemer

SilKit/source/core/participant/Participant.hpp

@@ -81,7 +81,7 @@ namespace SilKit {
 namespace Core {
 
 template <class SilKitConnectionT>
-class Participant : public IParticipantInternal
+class Participant final : public IParticipantInternal
 {
 public:
     // ----------------------------------------

SilKit/source/tracing/PcapReader.hpp

@@ -12,7 +12,7 @@
 namespace SilKit {
 namespace Tracing {
 
-class PcapReader : public SilKit::IReplayChannelReader
+class PcapReader final : public SilKit::IReplayChannelReader
 {
 public:
     // Constructors

SilKit/source/tracing/detail/NamedPipeLinux.hpp

@@ -11,7 +11,7 @@ namespace SilKit {
 namespace Tracing {
 namespace Detail {
 
-class NamedPipeLinux : public NamedPipe
+class NamedPipeLinux final : public NamedPipe
 {
 public:
     // ----------------------------------------