Cleanup includes

- Remove unused includes
- Use '<..>' style consistently
- Strip any paths from include
- Replace deprecated C++ headers
- Sort includes according to LLVM rules
  https://llvm.org/docs/CodingStandards.html#include-style

Signed-off-by: Thomas Lauf <thomas.lauf@tngtech.com>

src/Database.h

@@ -29,12 +29,12 @@
 
 #include <Datafile.h>
 #include <Interval.h>
-#include <Range.h>
-#include <Transaction.h>
-#include <vector>
-#include <string>
-#include <TagInfoDatabase.h>
 #include <Journal.h>
+#include <Range.h>
+#include <TagInfoDatabase.h>
+#include <Transaction.h>
+#include <string>
+#include <vector>
 
 class Database
 {