Allow file uploads of any size and better report active cameras in PhotonCamera error print (#1298)

Previously reported itself which was confusing. New print:

```
Error at org.photonvision.PhotonCamera.verifyVersion(PhotonCamera.java:378): Found the following PhotonVision cameras active on NetworkTables:
 ==> HD_Pro_Webcam_C920
 ==> Arducam_OV9281_USB_Camera
```

photon-lib/src/main/native/include/photon/PhotonCamera.h

@@ -26,6 +26,7 @@
 
 #include <memory>
 #include <string>
+#include <vector>
 
 #include <networktables/BooleanTopic.h>
 #include <networktables/DoubleArrayTopic.h>
@@ -182,10 +183,10 @@ class PhotonCamera {
   nt::BooleanPublisher driverModePublisher;
   nt::IntegerSubscriber ledModeSubscriber;
 
-  nt::MultiSubscriber m_topicNameSubscriber;
+  nt::MultiSubscriber topicNameSubscriber;
 
   std::string path;
-  std::string m_cameraName;
+  std::string cameraName;
 
   mutable Packet packet;
 
@@ -195,6 +196,8 @@ class PhotonCamera {
   inline static int InstanceCount = 0;
 
   void VerifyVersion();
+
+  std::vector<std::string> tablesThatLookLikePhotonCameras();
 };
 
 }  // namespace photon