Fix Windows compilation (#1568)

* Remove EXPORTs for ScrewVisual, ScrewDisplay

src/rviz/default_plugin/screw_display.h

@@ -29,7 +29,7 @@ namespace rviz
 class ScrewVisual;
 
 template <class MessageType>
-class RVIZ_EXPORT ScrewDisplay : public rviz::MessageFilterDisplay<MessageType>
+class ScrewDisplay : public rviz::MessageFilterDisplay<MessageType>
 {
 public:
   // Constructor.  pluginlib::ClassLoader creates instances by calling

src/rviz/default_plugin/screw_visual.h

@@ -13,7 +13,7 @@ class BillboardLine;
 namespace rviz
 {
 // ScrewVisual visualizes a single screw, i.e. a wrench, twist, or acceleration
-class RVIZ_EXPORT ScrewVisual
+class ScrewVisual
 {
 public:
   // Constructor.  Creates the visual stuff and puts it into the scene, but in an unconfigured state.

src/rviz/default_plugin/wrench_visual.h

@@ -8,7 +8,7 @@ namespace rviz
 {
 // For API compatibility we provide the old WrenchVisual class as well
 class [[deprecated("Replace with ScrewVisual")]] WrenchVisual;
-class RVIZ_EXPORT WrenchVisual : public ScrewVisual
+class WrenchVisual : public ScrewVisual
 {
 public:
   using ScrewVisual::ScrewVisual;