qt-brisa: add default content-type into http response, without this http header my philips tv hangs
qt-brisa: dump http data packets with peer address and port
qt-brisa: fix crash on free

This is possible fix of crash.
Seems to me we should not create httpmessage as a child of HttpSessionManager,
because it is a thread and moved to itself.

need to think carefully tomorrow.

==13552== Invalid read of size 1
==13552==    at 0x5E946FC: QObject::~QObject() (qobject.cpp:801)
==13552==    by 0x41A18B: Brisa::HttpMessage::~HttpMessage() (httpmessage.cpp:49)
==13552==    by 0x4137C2: Brisa::HttpRequest::~HttpRequest() (in /home/roman/devel/TvHolic/qt-brisa-mediaserver/brisamediaserver)
==13552==    by 0x413DFD: Brisa::BrisaWebserverSession::~BrisaWebserverSession() (brisawebserversession.cpp:62)
==13552==    by 0x413E9D: Brisa::BrisaWebserverSession::~BrisaWebserverSession() (brisawebserversession.cpp:65)
==13552==    by 0x5E8CFB6: QObjectPrivate::deleteChildren() (qobject.cpp:1889)
==13552==    by 0x5E95E6D: QObject::~QObject() (qobject.cpp:908)
==13552==    by 0x46BE75: Brisa::HttpSessionManager::~HttpSessionManager() (in /home/roman/devel/TvHolic/qt-brisa-mediaserver/brisamediaserver)
==13552==    by 0x46BEF3: Brisa::HttpSessionManager::~HttpSessionManager() (httpsessionmanager.h:37)
==13552==    by 0x416E6D: Brisa::HttpServer::~HttpServer() (httpserver.cpp:70)
==13552==    by 0x412A6B: Brisa::BrisaWebserver::~BrisaWebserver() (brisawebserver.cpp:47)
==13552==    by 0x412AD3: Brisa::BrisaWebserver::~BrisaWebserver() (brisawebserver.cpp:52)
==13552==  Address 0x20 is not stack'd, malloc'd or (recently) free'd
==13552==
==13552==
==13552== Process terminating with default action of signal 11 (SIGSEGV): dumping core
==13552==  Access not within mapped region at address 0x20
==13552==    at 0x5E946FC: QObject::~QObject() (qobject.cpp:801)
==13552==    by 0x41A18B: Brisa::HttpMessage::~HttpMessage() (httpmessage.cpp:49)
==13552==    by 0x4137C2: Brisa::HttpRequest::~HttpRequest() (in /home/roman/devel/TvHolic/qt-brisa-mediaserver/brisamediaserver)
==13552==    by 0x413DFD: Brisa::BrisaWebserverSession::~BrisaWebserverSession() (brisawebserversession.cpp:62)
==13552==    by 0x413E9D: Brisa::BrisaWebserverSession::~BrisaWebserverSession() (brisawebserversession.cpp:65)
==13552==    by 0x5E8CFB6: QObjectPrivate::deleteChildren() (qobject.cpp:1889)
==13552==    by 0x5E95E6D: QObject::~QObject() (qobject.cpp:908)
==13552==    by 0x46BE75: Brisa::HttpSessionManager::~HttpSessionManager() (in /home/roman/devel/TvHolic/qt-brisa-mediaserver/brisamediaserver)
==13552==    by 0x46BEF3: Brisa::HttpSessionManager::~HttpSessionManager() (httpsessionmanager.h:37)
==13552==    by 0x416E6D: Brisa::HttpServer::~HttpServer() (httpserver.cpp:70)
==13552==    by 0x412A6B: Brisa::BrisaWebserver::~BrisaWebserver() (brisawebserver.cpp:47)
==13552==    by 0x412AD3: Brisa::BrisaWebserver::~BrisaWebserver() (brisawebserver.cpp:52)
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