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.

komorebic.lib.sample.ahk

@@ -1,4 +1,4 @@
-; Generated by komorebic.exe generate-ahk-library
+; Generated by komorebic.exe
 
 Start() { 
     Run, komorebic.exe start, , Hide 
@@ -168,6 +168,6 @@ FocusFollowsMouse(boolean_state) {
     Run, komorebic.exe focus-follows-mouse %boolean_state%, , Hide 
 }
 
-AhkLib() { 
-    Run, komorebic.exe ahk-lib, , Hide 
+AhkLibrary() {
+    Run, komorebic.exe ahk-library, , Hide
 }