Some keybindings not work in FakeVim

Might be related to QTCREATORBUG-14413

Also reported in https://github.com/hluk/FakeVim/issues/41

```
nnoremap <Esc> :save<CR>
nmap <C-Enter> :projectrun<CR>
noremap <C-o> ,<C-o>
noremap <C-i> ,<C-i>
```

There are two issues. 1) The first two lines <Esc> and <C-Enter> don't work at all. It behaves like Esc and Enter. 2) <C-o> and <C-i> somehow redirect to the system's keybindings, but it only works on the first 2 or 3 key press.