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)

1 files changed, 3 insertions, 2 deletions

diff --git a/src/database.h b/src/database.h
index 867bca07f..9926c7b93 100644
--- a/src/database.h
+++ b/src/database.h
@@ -36,7 +36,7 @@ public:
 class MapDatabase : public Database
 {
 public:
-	virtual ~MapDatabase() {}
+	virtual ~MapDatabase() = default;
 
 	virtual bool saveBlock(const v3s16 &pos, const std::string &data) = 0;
 	virtual void loadBlock(const v3s16 &pos, std::string *block) = 0;
@@ -54,7 +54,8 @@ class RemotePlayer;
 class PlayerDatabase
 {
 public:
-	virtual ~PlayerDatabase() {}
+	virtual ~PlayerDatabase() = default;
+
 	virtual void savePlayer(RemotePlayer *player) = 0;
 	virtual bool loadPlayer(RemotePlayer *player, PlayerSAO *sao) = 0;
 	virtual bool removePlayer(const std::string &name) = 0;