refactor(derive-ahk): push up generation logic

This commit pushes as much of the generation logic as possible to the
derive-ahk crate, so that when it is used in komorebic, we only need to
do an as_bytes() call to prepare it for being written to a file.

Besides that, this commit changes the generation command name to
'ahk-library' for clarity, and adds both additional samples and
instructions in the readme file and Scoop post-install hook.

derive-ahk/src/lib.rs

@@ -83,13 +83,12 @@ pub fn ahk(input: proc_macro::TokenStream) -> proc_macro::TokenStream {
 
             quote! {
                 impl #name {
-                    fn ahk_functions() -> Vec<String> {
-                        let mut v: Vec<String> = vec![];
-                        v.push(String::from("; Generated by komorebic.exe ahk-lib"));
+                    fn generate_ahk_library() -> String {
+                        let mut v: Vec<String> = vec![String::from("; Generated by komorebic.exe")];
 
                         #stream
 
-                        v
+                        v.join("\n")
                     }
                }
             }