Fix cmake not adding Werror on clang, and _lots_ of warnings (#4963)

* Fix cmake not adding Werror on clang, and _lots_ of warnings

* WIP: Build fixes

* Cannot make intermediate blockhandler instance

* Tiger's changes

* Fix BitIndex check

* Handle invalid NextState values in cMultiVersionProtocol

Co-authored-by: Tiger Wang <ziwei.tiger@outlook.com>

src/Blocks/BlockOre.h

@@ -7,7 +7,7 @@
 
 
 
-class cBlockOreHandler:
+class cBlockOreHandler :
 	public cBlockHandler
 {
 	using Super = cBlockHandler;
@@ -16,6 +16,10 @@ public:
 
 	using Super::Super;
 
+protected:
+
+	~cBlockOreHandler() = default;
+
 private:
 
 	virtual cItems ConvertToPickups(NIBBLETYPE a_BlockMeta, const cEntity * a_Digger, const cItem * a_Tool) const override
@@ -124,3 +128,11 @@ private:
 
 
 
+
+class cDefaultOreHandler final :
+	public cBlockOreHandler
+{
+public:
+
+	using cBlockOreHandler::cBlockOreHandler;
+};