config: startup option for autocache pause

Makes debugging easier

app/config/config.cpp

@@ -96,6 +96,7 @@ void Config::SetDefaults()
   SetEntryInternal(QStringLiteral("AutoMergeTracks"), NodeValue::kBoolean, true);
   SetEntryInternal(QStringLiteral("UseSliderLadders"), NodeValue::kBoolean, true);
 
+  SetEntryInternal(QStringLiteral("AutoCacheEnabled"), NodeValue::kBoolean, true);
   SetEntryInternal(QStringLiteral("AutoCacheDelay"), NodeValue::kInt, 1000);
 
   SetEntryInternal(QStringLiteral("CatColor0"), NodeValue::kInt, 0);

app/render/previewautocacher.cpp

@@ -11,13 +11,14 @@ namespace olive {
 
 PreviewAutoCacher::PreviewAutoCacher() :
   viewer_node_(nullptr),
-  paused_(false),
   has_changed_(false),
   use_custom_range_(false),
   single_frame_render_(nullptr),
   last_update_time_(0),
   ignore_next_mouse_button_(false)
 {
+  paused_ = !Config::Current()[QStringLiteral("AutoCacheEnabled")].toBool(),
+
   SetPlayhead(0);
 
   delayed_requeue_timer_.setInterval(Config::Current()[QStringLiteral("AutoCacheDelay")].toInt());