narrow: move the ellipses server capability to core
This will be used in core logic to determining whether a server is ellipses
enabled or not. And also this will ease moving narrow related things to core.
Differential Revision: https://phab.mercurial-scm.org/D4809
BasedOnStyle: LLVM
IndentWidth: 8
UseTab: ForIndentation
BreakBeforeBraces: Linux
AllowShortIfStatementsOnASingleLine: false
IndentCaseLabels: false
AllowShortBlocksOnASingleLine: false
AllowShortFunctionsOnASingleLine: false
IncludeCategories:
- Regex: '^<'
Priority: 1
- Regex: '^"'
Priority: 2