Ensured the padding buffer is unlisted and wiped out when leaving VimRoom

[walkermatt]

Hi Mike,

I've been using VimRoom for a few weeks and find it works great in full screen. I use the LustyJuggler for switching buffers and found that the padding buffer called new was appearing in the buffer list once I'd used VimRoom hence the small changes:

Ensure that the padding buffer is not listed when in VimRoom by specifying:

setlocal nobuflisted
setlocal buftype=nofile
setlocal bufhidden=delete

Make sure the padding buffer is wiped out (and hence does not even appear when you :ls!) when leaving VimRoom

The padding buffer has been given the name of __vimroom__ to minimise clashes with real buffers and a check has been put in when leaving VimRoom to wipeout this buffer if it's found.

I've also refactored the code to set the buffer properties into a function (s:set_up_padding_buffer) to reduce duplication.

Thanks,

Matt.

[ches]

I'm afraid @mikewest may have notifications on this repo killfiled, but these are all great changes. Probably also fixes #32 and #40.

Thanks for the plugin Mike! Just ribbing you 😄

[walkermatt]

After using VimRoom for a couple of years I switched to https://github.com/junegunn/goyo.vim