add support for empty prefix
Sometimes variables must be grouped or defined in a backend with no common prefix. We can implement a zero prefix expression: [NAME]=VALUE
to deal with the case
with a vault secret defined as
SECRET: ....
REMARK_URL: ...
We could use
envlt -V '=vault:remark42:/kv/data/remark43#/data' -- remark42 server
to define SECRET
and REMARK_URL