Allow initializing wxScopedArray more conveniently.

Typical wxScopedArray initialization uses "new T[n]" expression, allow to omit
most of it and specify just n, the number of elements to allocate.

Use the new shorter form in the places where wxScopedArray(new ...) was used
(which is in almost all of them)

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@75504 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/scopedarray.h

@@ -25,6 +25,7 @@ public:
     typedef T element_type;
 
     wxEXPLICIT wxScopedArray(T * array = NULL) : m_array(array) { }
+    wxEXPLICIT wxScopedArray(size_t count) : m_array(new T[count]) { }
 
     ~wxScopedArray() { delete [] m_array; }