Tracker: more style fixes to ContainerWindow.cpp

* Rename templateMenu to templatesMenu.
* 80 char limit fixes
* whitespace fixes
* Declare 1 item per line.
* Don't set variables inline, set, then use.
* Explicit NULL comparisons
* {}'s around if statment with multi-line appearance
Tracker: fix bug introduced in hrev17795

Ticket #298 for context.

In BContainerWindow::AddWindowContextMenus() pasteItem is used but
not declared if CUT_COPY_PASTE_IN_CONTEXT_MENU is defined.