Fix some invalid heap ops found by Dr Memory

Sources/Plasma/Apps/plClient/winmain.cpp

@@ -896,7 +896,7 @@ static void LoadUserPass (LoginDialogParam *pLoginParam)
             if (temp)
             {
                 StrCopy(pLoginParam->username, temp, kMaxAccountNameLength);
-                delete temp;
+                delete[] temp;
             }
 
             pLoginParam->remember = stream->ReadBool();

Sources/Plasma/CoreLib/HeadSpin.cpp

@@ -366,8 +366,8 @@ char* hsStrcpy(char dst[], const char src[])
     {
         if (dst == nil)
         {
-            int count = strlen(src);
-            dst = (char *)malloc(count + 1);
+            size_t count = strlen(src);
+            dst = new char[count + 1];
             memcpy(dst, src, count);
             dst[count] = 0;
             return dst;

Sources/Plasma/PubUtilLib/plClientResMgr/plClientResMgr.cpp

@@ -101,7 +101,7 @@ void plClientResMgr::ILoadResources(const char* resfile)
                     char* tmp_name = in.ReadSafeStringLong();
                     std::string res_name = std::string(tmp_name);
                     std::string res_type = res_name.substr(res_name.length() - 4, 4);
-                    delete tmp_name;
+                    delete[] tmp_name;
 
                     // Version 1 doesn't encode format, so we'll try some simple
                     // extension sniffing

Sources/Plasma/PubUtilLib/plProgressMgr/plProgressMgr.cpp

@@ -94,7 +94,7 @@ plProgressMgr::~plProgressMgr()
 {
     for (int i=0; i < LOADING_RES_COUNT; i++)
     {
-        delete fImageRotation[i];
+        delete[] fImageRotation[i];
     }
 
     while( fOperations != nil )