Problem:
No way to set a buffer-local directory.
Use-cases:
- "Root dir" for LSP (and the "project" concept).
- `:terminal` OSC 7
Solution:
Add `:bcd` command.
- Extend `getcwd()` to take a third arg; `getcwd(-1, -1, bunfr)` returns
the buffer-local working directory.
- Buffer-local directories have less priority than window-local
ones, and more priority than tab-local ones.
Co-authored-by: Justin M. Keyes <justinkz@gmail.com>
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