C++11 patchset 9: move hardcoded init parameters to class definitions (part 1) (#5984)

* C++11 patchset 9: move hardcoded init parameters to class definitions

C++11 introduced the possibility to define the default values directly in class definitions, do it on current code

Also remove some unused attributes

* CollisionInfo::bouncy
* collisionMoveResult::collides_xy
* collisionMoveResult::standing_on_unloaded
* Clouds::speed

* More constructor cleanups + some variables removal

* remove only write guiFormSpecMenu::m_old_tooltip
* move header included inside defintions in genericobject.h
* remove some unused since years exception classes
* remove unused & empty debug_stacks_init
* remove unused & empty content_nodemeta_serialize_legacy
* remove forgotten useless bool (bouncy) in collision.cpp code

src/clientmedia.h

@@ -123,28 +123,28 @@ private:
 
 	// Has an attempt been made to load media files from the file cache?
 	// Have hash sets been requested from remote servers?
-	bool m_initial_step_done;
+	bool m_initial_step_done = false;
 
 	// Total number of media files to load
-	s32 m_uncached_count;
+	s32 m_uncached_count = 0;
 
 	// Number of media files that have been received
-	s32 m_uncached_received_count;
+	s32 m_uncached_received_count = 0;
 
 	// Status of remote transfers
 	unsigned long m_httpfetch_caller;
-	unsigned long m_httpfetch_next_id;
-	long m_httpfetch_timeout;
-	s32 m_httpfetch_active;
-	s32 m_httpfetch_active_limit;
-	s32 m_outstanding_hash_sets;
+	unsigned long m_httpfetch_next_id = 0;
+	long m_httpfetch_timeout = 0;
+	s32 m_httpfetch_active = 0;
+	s32 m_httpfetch_active_limit = 0;
+	s32 m_outstanding_hash_sets = 0;
 	std::unordered_map<unsigned long, std::string> m_remote_file_transfers;
 
 	// All files up to this name have either been received from a
 	// remote server or failed on all remote servers, so those files
 	// don't need to be looked at again
 	// (use m_files.upper_bound(m_name_bound) to get an iterator)
-	std::string m_name_bound;
+	std::string m_name_bound = "";
 
 };