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/environment.h

@@ -88,15 +88,15 @@ protected:
 	 * Below: values managed by m_time_lock
 	*/
 	// Time of day in milli-hours (0-23999); determines day and night
-	u32 m_time_of_day;
+	u32 m_time_of_day = 9000;
 	// Time of day in 0...1
-	float m_time_of_day_f;
+	float m_time_of_day_f = 9000.0f / 24000.0f;
 	// Stores the skew created by the float -> u32 conversion
 	// to be applied at next conversion, so that there is no real skew.
-	float m_time_conversion_skew;
+	float m_time_conversion_skew = 0.0f;
 	// Overriding the day-night ratio is useful for custom sky visuals
-	bool m_enable_day_night_ratio_override;
-	u32 m_day_night_ratio_override;
+	bool m_enable_day_night_ratio_override = false;
+	u32 m_day_night_ratio_override = 0.0f;
 	// Days from the server start, accounts for time shift
 	// in game (e.g. /time or bed usage)
 	std::atomic<u32> m_day_count;