Allow changing the event loop tick rate

This also changes the refresh rate for most plugins. You can now lower
this setting if your computer is struggling to keep up with rendering a
certain heavy plugin.

src/plugin/bridges/common.h

@@ -16,6 +16,8 @@
 
 #pragma once
 
+#include <iomanip>
+
 // Generated inside of the build directory
 #include <src/common/config/config.h>
 #include <src/common/config/version.h>
@@ -163,6 +165,12 @@ class PluginBridge {
         if (config.editor_xembed) {
             other_options.push_back("editor: XEmbed");
         }
+        if (config.frame_rate) {
+            std::ostringstream option;
+            option << "frame rate: " << std::setprecision(2)
+                   << *config.frame_rate << " fps";
+            other_options.push_back(option.str());
+        }
         if (!other_options.empty()) {
             init_msg << join_quoted_strings(other_options) << std::endl;
         } else {