support [[env]]

[jdx]

It needs to be possible to use multiple [env] in-case of using multiple directives, e.g.:

[[env]]
_.source = "./script_1.sh"
[[env]]
_.source = "./script_2.sh"

This would not be possible with just [env]. [env] will still work and be the preferred syntax, this is just to account for the rare case when this is needed.