Speed limit controller

Added toggle to control the cruise set speed according to speed limit supplied by OSM, NOO, or the vehicle itself.

Co-Authored-By: Jacob Pfeifer <jacob@pfeifer.dev>
Co-Authored-By: Efini <19368997+efini@users.noreply.github.com>
Co-Authored-By: Kumar <36933347+rav4kumar@users.noreply.github.com>

selfdrive/ui/qt/onroad.h

@@ -18,6 +18,7 @@ const int img_size = (btn_size / 4) * 3;
 
 // FrogPilot global variables
 static bool reverseCruise;
+static bool showSLCOffset;
 static bool speedHidden;
 static double fps;
 
@@ -169,6 +170,7 @@ private:
   bool muteDM;
   bool roadNameUI;
   bool showDriverCamera;
+  bool slcOverridden;
   bool turnSignalLeft;
   bool turnSignalRight;
   bool useSI;
@@ -176,6 +178,9 @@ private:
   float cruiseAdjustment;
   float laneWidthLeft;
   float laneWidthRight;
+  float slcOverriddenSpeed;
+  float slcSpeedLimit;
+  float slcSpeedLimitOffset;
   int bearingDeg;
   int cameraView;
   int conditionalSpeed;