CodeQL tweaks and fixes.

Updated CodeQL config to ignore source templates,
because they are not syntactically valid source code.
Ignore other stuff that is irrelevant to published
code quality.

Made various fixes based on helpful CodeQL analysis.

.github/workflows/codeql.yml

@@ -31,6 +31,9 @@ jobs:
         with:
           languages: ${{ matrix.language }}
           queries: +security-and-quality
+          paths-ignore: 'generate/template/astronomy.*'
+          paths-ignore: 'generate/eclipse/*.html'
+          paths-ignore: '**/astronomy.browser.js'
 
       - name: Autobuild
         uses: github/codeql-action/autobuild@v2