Please use *noremap flavor commands for all mappings

I have a mapping for `<C-o>` in insert mode set to `<C-w>`. So many insert mode mappings don't work because they are setup with imap, instead of inoremap. I changed it everywhere I could find, but you'll know better.

Please feel free to accept this pull request or address this issue in any other way you see fit. All I ask for is to use `[isvn]noremap` instead of `[isvn]map`.