The change from LLProcessLauncher to LLProcess introduces the possibility of a
NULL (default-constructed) LLProcessPtr. Add certain static LLProcess methods
accepting LLProcessPtr, forwarding to nonstatic method when non-NULL but doing
something reasonable with NULL. Use these methods in LLPLuginProcessParent.

The previous tip Windows APR package:
http://automated-builds-secondlife-com.s3.amazonaws.com/hg/repo/3p-apr/rev/256201/arch/CYGWIN/installer/apr_suite-1.4.5-windows-20120509.tar.bz2
contained a libapr-1.dll that would not load on Windows XP. The code contained
static calls to Windows API functions not yet present in Windows XP.
The new Windows APR package has made those calls conditional, using
LoadLibrary() and GetProcAddress() calls.
The hope is that this new viewer build will behave identically on Windows
Vista or later -- but unlike its predecessor, will also launch on Windows XP.

- Fix for potential truncation

don't auto position other floater when it is hosted

- Requested permissions are added dynamically to the dialog's footer
- And the footer is not shown when it is empty

- Added new tag called "footer" to the notification. This tag allows to display messages under the buttons in toasts.
- Created new class LLToastScriptQuestion for the "ScriptQuestionCaution" notification. This notification supports tag <footer>.