Add templated CHeap::Allocate function

Add a templated `CHeap::Allocate` function to simplify memory allocation of objects using `CHeap`. The function uses perfect forwarding to construct objects with the specified arguments.

src/engine/client/serverbrowser.cpp

@@ -657,7 +657,7 @@ void CServerBrowser::SetLatency(NETADDR Addr, int Latency)
 CServerBrowser::CServerEntry *CServerBrowser::Add(const NETADDR *pAddrs, int NumAddrs)
 {
 	// create new pEntry
-	CServerEntry *pEntry = (CServerEntry *)m_ServerlistHeap.Allocate(sizeof(CServerEntry));
+	CServerEntry *pEntry = m_ServerlistHeap.Allocate<CServerEntry>();
 	mem_zero(pEntry, sizeof(CServerEntry));
 
 	// set the info

src/engine/shared/console.h

@@ -172,7 +172,7 @@ class CConsole : public IConsole
 
 		void AddEntry()
 		{
-			CQueueEntry *pEntry = static_cast<CQueueEntry *>(m_Queue.Allocate(sizeof(CQueueEntry)));
+			CQueueEntry *pEntry = m_Queue.Allocate<CQueueEntry>();
 			pEntry->m_pNext = 0;
 			if(!m_pFirst)
 				m_pFirst = pEntry;

src/engine/shared/memheap.h

@@ -4,6 +4,9 @@
 #define ENGINE_SHARED_MEMHEAP_H
 
 #include <cstddef>
+#include <new>
+#include <utility>
+
 class CHeap
 {
 	struct CChunk
@@ -32,5 +35,12 @@ public:
 	void Reset();
 	void *Allocate(unsigned Size, unsigned Alignment = alignof(std::max_align_t));
 	const char *StoreString(const char *pSrc);
+
+	template<typename T, typename... TArgs>
+	T *Allocate(TArgs &&... Args)
+	{
+		return new(Allocate(sizeof(T), alignof(T))) T(std::forward<TArgs>(Args)...);
+	}
 };
+
 #endif

src/game/client/components/voting.cpp

@@ -163,7 +163,7 @@ void CVoting::AddOption(const char *pDescription)
 			m_pRecycleLast = 0;
 	}
 	else
-		pOption = (CVoteOptionClient *)m_Heap.Allocate(sizeof(CVoteOptionClient));
+		pOption = m_Heap.Allocate<CVoteOptionClient>();
 
 	pOption->m_pNext = 0;
 	pOption->m_pPrev = m_pLast;