Cleanup code and docs; add missing header.

- The source and header files should have standard comment headers.
- Windows support has been removed, as I've decomissioned my Windows
  desktop in favour of a Linux desktop.
- Commander.h wasn't being added to the install directory.

.idea/klib.iml

@@ -1,2 +1,8 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<module classpath="CMake" type="CPP_MODULE" version="4" />
+<module classpath="CMake" type="CPP_MODULE" version="4">
+  <component name="FacetManager">
+    <facet type="Python" name="Python facet">
+      <configuration sdkName="Python 3.10 (scsl)" />
+    </facet>
+  </component>
+</module>

.idea/misc.xml

@@ -1,4 +1,7 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <project version="4">
+  <component name="Black">
+    <option name="sdkName" value="Python 3.10 (scsl)" />
+  </component>
   <component name="CMakeWorkspace" PROJECT_DIR="$PROJECT_DIR$" />
 </project>