Codeql updates (#11)

* remove unused C# code

* create .gitignore for unused C# code

* run codeql CI weekly even when there are no new commits

Author: tgauth

.azdo/codeql.yml

@@ -3,11 +3,12 @@ name: $(BuildDefinitionName)-$(date:yyMM).$(date:dd)$(rev:rrr)
 trigger: none
 
 schedules:
-- cron: "0 10 * * 1-5"
-  displayName: Daily CodeQL Build
+- cron: "0 10 * * 1"
+  displayName: Weekly CodeQL Build
   branches:
     include:
     - master
+  always: true # should run even if there are no new commits
 
 stages:
 - stage: Build
@@ -27,7 +28,7 @@ stages:
     steps:
     - task: CodeQL3000Init@0
       displayName: Initialize CodeQL
-    
+
     - pwsh: |
         Write-Verbose "Starting the build configuration:Release Platform:x64"
         $buildLogPath = "$(Build.SourcesDirectory)\build\build_x64_Release.log"

.gitignore

@@ -0,0 +1,2 @@
+# unused C# code that gets flagged by CodeQL
+contrib/dotzlib/