apply chatroom settings on main window, update todo list
make some components transparent so that it is easier to set background
color
apply nickname and text color/font on chatroom, disable Bold/Italic
options for Font dialog
MainWindow: add appendChatMsg, appendSysMsg interface, ChatroomSetPane:
minor bug fixes
adjust MainWindow layout for fitting customize window sizes, IRCBot: hide
real password from log
change button/option names, now you can set inner chatroom size instead of
the whole window size