tools: add performance-log-viewer.py and driver
performance-log-viewer.py is a viewer for GIMP performance logs. The viewer is made up of two parts: a sample-selection area at the top, and an information area at the bottom. The sample-selection area visualizes the sampled variables and markers using a simultaneous set of plots, and displays the currently selected samples. Samples can be selected directly through the sample-selection area, or by other means, such as searching for all samples satisfying a certain condition, or containing a certain function. The information area shows global information stored in the log, as well as information specific to the currently selected samples, including variable listing and statistics, full backtrace, and profile/call-graph information. Note that performance-log-viewer.py takes its input from STDIN, like the rest of the performance-log tools, and is therefore suitable for use as part of a pipeline. For standalone use, the performance-log-viewer driver is also included, which takes the log file as a command-line argument, and processes it through an appropriate pipeline before feeding it to the viewer.
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