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Let's see if this is better in Vim 8.2.

The previous autocmd was being overridden by viminfo preserving the line
number.  This adds a new autocmd that runs after viminfo is loaded.

This reverts commit 7a67e70f.

Work around painfully slow syntax highlighting for ruby/perl/others: use
the legacy regexp engine.  Bug reports suggest this problem is specific
to 'relativenumber' configurations, but the slowness arises with
'hlsearch' too.

Turns out the default regexpengine=2 is also painfully slow when
searching, so go back to showing relative number and then we'll set
regexpengine=1.

This reverts commit f10f1a84.

While [patch
8.1.0374](https://github.com/vim/vim/commit/bd9a53c06c8869ad811cb3dd01a309c9be7d7a63)
seems to fix scrolling, relativenumber is still painfully slow when
typing code under the default regexpengine.  Setting regexpengine=1
helps, but doesn't solve the problem, it only hides it with a faster
regex implementation.  The only use of the relativenumber line was for
jumps and the occasional line changes/deletions.  I should use / and ?
searches instead.

The trigram glyph is properly a two character width glyph which is not
properly reported by `wcwidth` in many operating systems.

To indicate truecolor and powerline support in a more granular way, and
support using unconfigured terminals (like on public computers) which
may have 256-color support but no powerline font.

Feeling pretty confident in normal mode now, so re-enable this (to help
out with fixing bad auto-indentation, especially).

I often lose what's in my clipboard with simple editing commands and
the clipboard can just as easily be explicitly accessed through the *
and + registers ("+y; "+p; etc.).

The semantics of the powerline separator don't seem well-suited to a
list of independent items like a list of buffers or tabs; and the
separators don't match the tmux theme I settled on.

This reverts commit d365bf8f.

Decided they don't make sense semantically and don't blend in with my
other apps (looking at you, Tmux) very well.