Move config parsing to util crate

Cargo.lock

@@ -260,7 +260,6 @@ dependencies = [
  "bscreensaver-command",
  "bscreensaver-util",
  "clap",
- "humantime",
  "log",
  "nix",
  "xcb",
@@ -333,6 +332,7 @@ dependencies = [
  "anyhow",
  "clap",
  "env_logger",
+ "humantime",
  "lazy_static",
  "libc",
  "toml",
@@ -1088,9 +1088,9 @@ dependencies = [
 
 [[package]]
 name = "num-traits"
-version = "0.2.14"
+version = "0.2.15"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "9a64b1ec5cda2586e284722486d802acf1f7dbdc623e2bfc57e65ca1cd099290"
+checksum = "578ede34cf02f8924ab9447f50c28075b4d3e5b269972345e7e0372b38c6cdcd"
 dependencies = [
  "autocfg",
 ]