add splitter and tab for webview
splitter view/hide
add tab action(add tab/remove tab/reload tab)
add change mode mobile to pc
add setting font family for webview
add TabWidget class
update tabbing function
save splitter size
save tab pages
add key board shortcut
save mobile mode in tab
copy to other pc
add favorite for split window
resolve conflict
resolve
Merge branch 'split-window' of https://github.com/ioriayane/KanmusuMemory into split-window

Conflicts:
	favoritemenu.cpp
	favoritemenu.h
	mainwindow.cpp
update favorite  menu
update save feature for Fav.
add reload, go back, go forward buttons
update japanese words