Vim's :terminal feels much more ergonomic, adding various mappings to
make the experience more similar, mainly by adding a few `<C-w>`
mappings for the most common actions.
Additionally, disable vim-tmux-navigators default mappings and setup
both normal and terminal mode mappings for `<C-w>{h,j,k,l}` in addition
to the normal mode mappings for `<C-{h,j,j,l}>` to make the pane
switching experience more consistent across all buffer types.