Make GetSerializeSize a wrapper on top of CSizeComputer

Given that in default GetSerializeSize implementations created by
ADD_SERIALIZE_METHODS we're already using CSizeComputer(), get rid
of the specialized GetSerializeSize methods everywhere, and just use
CSizeComputer. This removes a lot of code which isn't actually used
anywhere.

For CCompactSize and CVarInt this actually removes a more efficient
size computing algorithm, which is brought back in a later commit.

src/addrman.h

@@ -448,11 +448,6 @@ public:
         Check();
     }
 
-    unsigned int GetSerializeSize(int nType, int nVersion) const
-    {
-        return (CSizeComputer(nType, nVersion) << *this).size();
-    }
-
     void Clear()
     {
         std::vector<int>().swap(vRandom);