merge more config file settings into config

[aikomastboom]

When I tried setting editor_cmd in my .projectable.toml file.. expecting it to override both the default vi and $EDITOR env.

It doesn't get used by the application.

This PR adds a few "missing" fields to the merge part of the configuration.

If these are omitted by design.. please feel free to discard this PR.

NOTE: this change gives (local) config precedence over env which might not be what is desired. Maybe the order of evaluation should be 1): env -> local config -> global config -> default
With this PR it appears to become 2): local config -> global config -> env -> default
Without this PR it is 3): env -> default

[Absobel]

Ah you're right ! I totally forgot this was a thing when i added editor_cmd

[dzfrias]

Great catch! The current merging implementation is definitely not ideal...

Anyway, thanks for the PR and I'll merge this in shortly!