This segment has the same functionality and interface as the Syntastic
Vim segment plugin, and the code is largely adapted from it.
Documentation stub is also included
If somebody needs to readd it he should make better code, specifically:
- Functions and variables necessary for supporting Control-P need to be defined
in a separate initialiazation function that is only called if Control-P was
found.
- Segments that show different information must be defined as separate segments
that may be put into configuration file.
- Segment functions must not know side they are on.
- Segment functions must not emit `priority`, it must go to configuration file.
- Segment functions must have proper documentation.
- Segment functions must not emit `width` and `align` keys.
- String `Loading...` or the equivalent must be overridable from configuration,
same for other interface strings (e.g. what is shown when `regex` is true).
- Segment functions must have names that make it clear what they emit.
Closes#1244