Menuconfig Implementation and auto-qemu refactoring (#44)

* unify the chardev backend definitions

* add --dry option for dry-running
* allow supply extra raw qemu options

* implement ncurses based tui framework

* basic lunamenu framework built on top libtui

* (libtui) add scrollable, list, textbox
* (menu) add listview, dialogue

* interface LunaConfig into menuconfig

* remove flickering when new context being added and redrawn
* add ability to navigate, edit the config node
* adjust the layout parameters
* some refactors

* add help dialogue

* layout refinement
* add <BACKSPACE> as hot key to navigate up level
* add confirmation dialogue for exiting
* refactors

* add user friendly alias to LConfig terms

* fix the focusing problem with textbox

* bypass the configuration for user program generation

* bypass the showing of config view during usr program generation, use
  default value instead
* house keeping stuff

* add terminal dimension check and fallback to prompt based

* replenish the help messages
* fix: udiv64 is not used when doing u64 division