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This reverts commit f09af571.

It is far more aesthetically pleasing, and conveys the correct amount of information. The exact numeric status code is extremely rarely of use, and increases cognitive parsing burden on the user.
(cherry picked from commit 8f664edcaf55adcc540f0fe43d4205b66e4f9fb6)

- single-line prompt
- removed the extra line after each command output

Cleans up minimal theme by not using a custom prompt function
Removed case of 2 spaces showing if not in a version controlled folder
Adds support for svn_prompt_info

For non-trailing path components, we show only the first character. So, as in Fish proper, we convert ~/some/really/really/really/long/path/name to ~/s/r/r/r/l/p/name.