history: base working implementation
privacy setting form added
preview of emoticons
style selector

Unfortunately Qt developers removed some old native skins from support, only 3 skins are supported on Linux.
Number of native skins depends on OS and Qt built system.
History: keep unencrypted history
class expantion
add insert chatlog capability (not finished)
clear chat area
History: retrieve history from save
Merge remote-tracking branch 'upstream/master' into history

Conflicts:
	qtox.pro
cleanup
error handling for missing graphical icons

preview of emoticons based on dynamic list of emoticons, not hardcoded anymore
partial work towards core encryption functionality
yup, too many brackets
more
add save encryption
finished core functionality, still needs UI from #423
this also depends on irungentoo/toxcore#1114 being merged
typos
Merge branch 'master' into corencryption
Merge remote-tracking branch 'upsteam/master' into style