qalc CLI mode

[JJRcop]

I think it would be useful to feature a mode which opens a terminal connected up to the libqalculate shell/qalc, so you can use the app like qalc if you wish to. The terminal would pull up the keyboard and let you start typing. In this mode typing in a command does not evaluate it live until you press enter or OK, so it functions like if you ran the qalc program on PC.