Creating Console2
Add screen_witdh, height. Change window_height, width base function.
Override Kernel#p test
Override Kernel#p when called Console2#init
Change to void the return value of ScriptEngine::funcallIf()

Can't use return value to call mrb_gc_arena_save & restore
Console2 move builtin.rb (Rename Console)
Writing Console#draw is unnecessary
Bug fix