history: base working implementation
privacy setting form added
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
partial work towards core encryption functionality
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 branch 'master' into history

Conflicts:
	qtox.pro
	src/widget/form/chatform.cpp
	src/widget/form/settings/privacyform.cpp
add decryption
Merge branch 'master' into corencryption

Conflicts:
	src/core.cpp
precise timestamps keeping
correct action saving into the logfile