Implemented count() and isEmpty() for dictionaries
Implemented count() and isEmpty() for dictionaries

Closes #451

ramiusGitHub/WCF,SoftCreatR/WCF,joshuaruesweg/WCF,Morik/WCF,cashcat/WCF-1,Cyperghost/WCF,WoltLab/WCF,PhrozenByte/WCF2,SoftCreatR/WCF,MenesesEvandro/WCF,PhrozenByte/WCF2,SoftCreatR/WCF,Cyperghost/WCF,WoltLab/WCF,NBZ4live/WCF,Morik/WCF,WoltLab/WCF,Cyperghost/WCF,Morik/WCF,MeinAccount/WCF,joshuaruesweg/WCF,0xLeon/WCF,SoftCreatR/WCF,Cyperghost/WCF,0xLeon/WCF,MeinAccount/WCF,joshuaruesweg/WCF,0xLeon/WCF,ramiusGitHub/WCF,WoltLab/WCF,MenesesEvandro/WCF,Cyperghost/WCF,Morik/WCF,NBZ4live/WCF,cashcat/WCF-1