Update MFEK clap fork to 3.0.5

Although I once thought that it's likely we'd be able to go back to
master `clap`, MFEK might have to maintain its fork indefinitely.

`clap`'s maintainer @epage unfortunately wrote in clap-rs/clap#3008:

>  We might find it just isn't worth completing this.

Cargo.toml

@@ -8,7 +8,7 @@ edition = "2018"
 
 [dependencies]
 # parse command line arguments
-clap = { git = "https://github.com/MFEK/clap.rlib", branch = "validator_all" }
+clap = { git = "https://github.com/MFEK/clap.rlib", branch = "master" }
 
 # parses .glif files 
 glifparser = { git = "https://github.com/MFEK/glifparser.rlib", branch = "master", features=["mfek"] }

src/constant_width_stroke.rs

@@ -272,7 +272,7 @@ pub fn cws_cli(matches: &clap::ArgMatches) {
             width: path.width,
             unicode: path.unicode,
             name: path.name,
-            lib: None,
+            lib: path.lib,
             components: path.components,
             guidelines: path.guidelines,
             images: path.images,

src/nib_stroke.rs

@@ -16,29 +16,29 @@ pub fn clap_app() -> clap::App<'static> {
             .short('n')
             .long("nib")
             .takes_value(true)
-            .about("The path to the nib file. FontForge is quite strict about these. The .glif must contain a single closed spline, running clockwise, which represents a convex shape.")
+            .help("The path to the nib file. FontForge is quite strict about these. The .glif must contain a single closed spline, running clockwise, which represents a convex shape.")
             .required(true))
         .arg(Arg::new("input")
             .display_order(2)
             .short('i')
             .long("input")
             .takes_value(true)
-            .about("The path to the input path file.")
+            .help("The path to the input path file.")
             .required(true))
        .arg(Arg::new("output")
             .display_order(3)
             .short('o')
             .long("output")
             .takes_value(true)
-            .about("The path where the output .glif will be saved.")
+            .help("The path where the output .glif will be saved.")
             .required(true))
        .arg(Arg::new("accuracy")
             .display_order(4)
             .short('a')
             .long("accuracy")
             .takes_value(true)
             .default_value("0.25")
-            .about("<f64> Accuracy target")
+            .help("<f64> Accuracy target")
             .validator(super::arg_validator_positive_f64)
             .required(false))
 }