Add game clock commands, command completions and Cyrene login tooling

run.ps1

@@ -102,6 +102,15 @@ try {
         $value = [Environment]::GetEnvironmentVariable($variables[$key])
         if ($null -ne $value) { $settings | Add-Member -MemberType NoteProperty -Name $key -Value $value -Force }
     }
+    $clockPathOverride = [Environment]::GetEnvironmentVariable('GAC_GAME_CLOCK_STATE_FILE')
+    if ($null -ne $clockPathOverride) {
+        if (-not $settings.game_clock) { $settings | Add-Member -MemberType NoteProperty -Name game_clock -Value ([pscustomobject]@{}) }
+        $settings.game_clock | Add-Member -MemberType NoteProperty -Name state_file -Value $clockPathOverride -Force
+    }
+    if ($settings.game_clock -and $null -ne $settings.game_clock.state_file) {
+        if ($settings.game_clock.state_file -isnot [string] -or [string]::IsNullOrWhiteSpace($settings.game_clock.state_file)) { throw 'game_clock.state_file must be a nonempty path.' }
+        if (Test-Path -LiteralPath (Resolve-ProjectPath $settings.game_clock.state_file) -PathType Container) { throw 'game_clock.state_file must be a file path.' }
+    }
     foreach ($pair in @(@('begin_time','GAC_ACTIVITY_BEGIN_TIME'),@('end_time','GAC_ACTIVITY_END_TIME'))) {
         $value = [Environment]::GetEnvironmentVariable($pair[1])
         if ($null -ne $value) {