Passthrough Control Mappings. <C-w>, <C-d>, <C-u>, etc.

[ddrscott]

These are the 3 most common default ctrl mappings I use. It would be great if the worked.
Here's a screen shot of the send natively using insert mode <C-v>.

Some system info:
Mac OS 10.11.6

NVIM v0.2.2
Build type: Release
LuaJIT 2.0.5
Compilation: /usr/local/Homebrew/Library/Homebrew/shims/super/clang -Wconversion -U_FORTIFY_SOURCE -D_FORTIFY_SOURCE=1 -DNVIM_MSGPACK_HAS_FLOAT32 -DNVIM_UNIBI_HAS_VAR_FROM -DNDEBUG -DMIN_LOG_LEVEL=3 -Wall -Wextra -pedantic -Wno-unused-parameter -Wstrict-prototypes -std=gnu99 -Wimplicit-fallthrough -Wvla -fstack-protector-strong -fdiagnostics-color=auto -DINCLUDE_GENERATED_DECLARATIONS -I/tmp/neovim-20171118-36724-uevp4/neovim-0.2.2/build/config -I/tmp/neovim-20171118-36724-uevp4/neovim-0.2.2/src -I/usr/local/include -I/usr/local/include -I/usr/local/include -I/usr/local/include -I/usr/local/include -I/usr/local/include -I/usr/local/opt/gettext/include -I/usr/include -I/tmp/neovim-20171118-36724-uevp4/neovim-0.2.2/build/src/nvim/auto -I/tmp/neovim-20171118-36724-uevp4/neovim-0.2.2/build/include
Compiled by [email protected]

Features: +acl +iconv +jemalloc +tui
See ":help feature-compile"

   system vimrc file: "$VIM/sysinit.vim"
  fall-back for $VIM: "/usr/local/Cellar/neovim/0.2.2/share/nvim"