Renderstamp/autosave filename special characters

These symbols, when put in the render stamp text, get replaced with corresponding statistics/render information. All symbols here are case insensitive (Corona 1.6+).

Symbol Meaning
%pr Performance: Rays per second
%pp Performance: Passes
%pe Performance: Noise level
%pt Performance: Total elapsed time
%pts Performance: Secondary solver precomputation time (in milliseconds)
%ptp Performance: Parsing time in milliseconds (since version 1.6)
%ptg Performance: Geometry preprocessing time in milliseconds (since version 6)
%ptd Performance: Denoising time (since version 7)
%ps Performance: Rays per sample
%sl Scene: Number of light primitives
%so Scene: Number of objects
%si Scene: Number of instanced primitives
%su Scene: Number of unique primitives
%sd Scene: Number of displacement primitives
%c CPU name
%ct Number of CPU(s) threads (since version 1.6)
%i This computer name
%f Currently rendered filename
%n Actual frame number
%d Current date/time
%h Current time
%b Corona build datestamp
%bn Corona build name (since version 1.6)
%v Current camera name
%o Output filename. Results are undefined if there is no output filename specified.
%mc Memory currently allocated by Corona (since version 3)
%mcp Peak memory allocated by Corona during the last rendering (since version 3)
%mp Virtual memory currently used by the process (since version 3)
%mpp Peak virtual memory used by the process (since version 3)
%ms Virtual memory used by the system (since version 3)

This works exactly the same for renderstamp and for autosave filenames.

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