implemented inIntervall function (for deletion)

repos/entities/rocketchatmessage.cpp

@@ -197,3 +197,8 @@ void RocketChatMessage::setRoomeTyp( const QString &value )
 {
     roomeTyp = value;
 }
+
+bool RocketChatMessage::inTimeIntervall(const qint64 newt,const qint64 oldt)
+{
+    return getTimestamp() >= oldt && getTimestamp() <= newt;
+}

repos/entities/rocketchatmessage.h

@@ -96,7 +96,7 @@ class RocketChatMessage
 
         const QString &getRoomeTyp() const;
         void setRoomeTyp( const QString &value );
-
+        bool inTimeIntervall(const qint64 newt,const qint64 oldt);
     protected:
         bool empty = false;
         qint64 timestamp = 0;