Added directly copy-paste message and emoji support

[xandross389]

• Added param use_copy_paste to core.send_message(), whats.sendwhatmsg_to_group(), and whats.sendwhatmsg_to_group_instantly() methods, default to False so no code break, developer can shoose if write character by character or paste full mesage (this allow send emojis very easy!!!)
• Added capacity to send messages tha contains emojis (library emoji dependent) in core.send_message()
• dependency of emoji library added to requeriments.txt

[xandross389]

If PR accepted and merged I could add this functionalities to the others send functions