StandalonePluginHolder:  Fix out-of-bounds read when audio callbacks use larger-than-expected buffers

Projucer:  Fixed a potential crash in JucerTreeViewBase when dereferencing a deleted pointer to the underlying TreeViewItem

When passing in valid data with zero size, replaceWith() will do nothing and leave the MemoryBlock in its previous state which may be unexpected. replaceAll() will reset the MemoryBlock and resize it to 0

The plugin should interpret the arguments as VstSpeakerArrangement**
instances. It should modify the pointed-to VstSpeakerArrangement* so
that it points to a long-lived VstSpeakerArrangement in the plugin.

Audition incorrectly increments the ref-count of the IPlugView* returned from IEditController::createView() and never fully releases it. This commit reverts e0306d25 for Audition to ensure that an editor is always returned, otherwise Audition displays a blank GUI.

TextEditor:  Use caret position relative to the Component top-left when calculating scroll amounts in scrollEditorToPositionCaret() and scrollToMakeSureCursorIsVisible()