Modernize src/c* src/d* and src/e* files (#6263)

* Modernize src/c* src/d* and src/e* files

* default operator
* redundant init
* delete default constructors on CraftDefinition childs (never used)
* fix some missing init values
* const ref fix reported by clang-tidy
* ranged-based for loops
* simple conditions & returns
* empty stl function instead of size
* emplace_back stl function instead of push_back + construct temp obj
* auto for some iterators
* code style fixes
* c++ stl headers instead of C stl headers (stdio.h -> cstdio)

src/content_cso.cpp

@@ -30,7 +30,7 @@ class SmokePuffCSO: public ClientSimpleObject
 	scene::IBillboardSceneNode *m_spritenode = nullptr;
 public:
 	SmokePuffCSO(scene::ISceneManager *smgr,
-			ClientEnvironment *env, v3f pos, v2f size)
+			ClientEnvironment *env, const v3f &pos, const v2f &size)
 	{
 		infostream<<"SmokePuffCSO: constructing"<<std::endl;
 		m_spritenode = smgr->addBillboardSceneNode(