[refactor] environment for swhkd

[newtoallofthis123]

This change introduces similar changes as #243 for swhkd.

The following were the changes made:

• Added a new environ.rs which is central to the environment management system
• Refactored env::var uses across the daemon.rs
• Removed unsafe env uses

[newtoallofthis123]

looks good. lgtm

Thanks!

[Shinyzenith]

Hi, I didn't get a chance to test this pr @zubairmh Did you do so?

[newtoallofthis123]

Added some stuff that would enable the environ.rs to check if the path provided is valid or not

[Shinyzenith]

This looks good to me. I haven't gotten around to testing it yet. @newtoallofthis123 Have you tested the PR?

[newtoallofthis123]

I did test it a while ago and everything seemed to work fine 😄

However, I'll test it again tomorrow and let you know just to be safe :)

[Shinyzenith]

@newtoallofthis123 looks good to go, have you tested this?

[newtoallofthis123]

Yep! tested it and it works :)