Support using DCD's `--search` flag.

This is useful for searching declarations by providing the name, or for
bypassing the context-sensitive searching when DCD can't properly follow
the declarations chain from the usage to the declaration.
Add the DUDCDrestartServer and DUDCDclearCache commands
Recognize the project's root and run commands there
Fix for older versions of Vim

Where globpath can not split lines by itself...
Bump minor version