[wpiutil,glass,dlt] Replace libprotobuf with upb for dynamic decode (#7988)

libprotobuf is a very annoying dependency to deal with, and with the switch to nanopb for generated C++ code, libprotobuf is only used for dynamic decode in the GUI apps. libprotobuf has been swapped out with upb, a much smaller C-based library that supports reflection and can therefore do dynamic decode. This means we can remove the libprotobuf dependency and stop dealing with build issues because of it.

wpiutil/src/main/native/include/wpi/ProtoHelper.h

@@ -1,18 +0,0 @@
-// Copyright (c) FIRST and other WPILib contributors.
-// Open Source Software; you can modify and/or share it under the terms of
-// the WPILib BSD license file in the root directory of this project.
-
-#pragma once
-
-#include <google/protobuf/message.h>
-
-namespace wpi {
-template <typename T>
-inline T* CreateMessage(google::protobuf::Arena* arena) {
-#if GOOGLE_PROTOBUF_VERSION < 4000000
-  return google::protobuf::Arena::CreateMessage<T>(arena);
-#else
-  return google::protobuf::Arena::Create<T>(arena);
-#endif
-}
-}  // namespace wpi

wpiutil/src/main/native/include/wpi/protobuf/ProtobufMessageDatabase.h

@@ -1,77 +0,0 @@
-// Copyright (c) FIRST and other WPILib contributors.
-// Open Source Software; you can modify and/or share it under the terms of
-// the WPILib BSD license file in the root directory of this project.
-
-#pragma once
-
-#include <memory>
-#include <span>
-#include <string>
-#include <string_view>
-#include <vector>
-
-#include <google/protobuf/descriptor.pb.h>
-#include <google/protobuf/descriptor_database.h>
-#include <google/protobuf/dynamic_message.h>
-
-#include "wpi/StringMap.h"
-
-namespace wpi {
-
-/**
- * Database of protobuf dynamic messages. Unlike the protobuf descriptor pools
- * and databases, this gracefully handles adding descriptors out of order and
- * descriptors being replaced.
- */
-class ProtobufMessageDatabase {
- public:
-  /**
-   * Adds a file descriptor to the database. If the file references other
-   * files that have not yet been added, no messages in that file will be
-   * available until those files are added. Replaces any existing file with
-   * the same name.
-   *
-   * @param filename filename
-   * @param data FileDescriptorProto serialized data
-   * @return False if could not parse data
-   */
-  bool Add(std::string_view filename, std::span<const uint8_t> data);
-
-  /**
-   * Finds a message in the database by name.
-   *
-   * @param name type name
-   * @return protobuf message, or nullptr if not found
-   */
-  google::protobuf::Message* Find(std::string_view name) const;
-
-  /**
-   * Gets message factory.
-   *
-   * @return message factory
-   */
-  google::protobuf::MessageFactory* GetMessageFactory() {
-    return m_factory.get();
-  }
-
- private:
-  struct ProtoFile {
-    std::unique_ptr<google::protobuf::FileDescriptorProto> proto;
-    std::vector<std::string> uses;
-    bool complete = false;
-    bool inPool = false;
-  };
-
-  void Build(std::string_view filename, ProtoFile& file);
-  bool Rebuild(ProtoFile& file);
-
-  std::unique_ptr<google::protobuf::DescriptorPool> m_pool =
-      std::make_unique<google::protobuf::DescriptorPool>();
-  std::unique_ptr<google::protobuf::DynamicMessageFactory> m_factory =
-      std::make_unique<google::protobuf::DynamicMessageFactory>();
-  wpi::StringMap<ProtoFile> m_files;  // indexed by filename
-  // indexed by type string
-  mutable wpi::StringMap<std::unique_ptr<google::protobuf::Message>> m_msgs;
-};
-
-}  // namespace wpi