BlockHandler initialisation is a constant expression (#4891)

* BlockHandler initialisation is a constant expression

If we can't make it all namespaces, this is the next best I guess.

+ Tag handlers constexpr, const as needed
+ Inherit constructors
* Privatise handler functions

* More constexpr

Co-authored-by: Alexander Harkness <me@bearbin.net>

src/BlockInfo.cpp

@@ -2,7 +2,6 @@
 
 #include "BlockInfo.h"
 #include "BlockType.h"
-#include "Blocks/BlockHandler.h"
 
 
 
@@ -422,15 +421,6 @@ cBlockInfo::cBlockInfo():
 
 
 
-cBlockHandler * cBlockInfo::GetHandler(BLOCKTYPE a_Type)
-{
-	return &cBlockHandler::GetBlockHandler(a_Type);
-}
-
-
-
-
-
 float cBlockInfo::GetExplosionAbsorption(const BLOCKTYPE Block)
 {
 	switch (Block)