Rename all "Mosaic" occurrences as "Pixelate"
Remove "Soften", "Soften More", "Blur", "Blur More" filters

These were placeholders while I reworked more advanced blur filters.
Now that box blur and gaussian blur work brilliantly, it's time to
remove these old, naive implementations.
Format effect time-to-completion display
Disable all mouse subclassing in the IDE

While it generally works without incident, it's not foolproof - some
lingering hard crashes continue to elude me, and this is an obvious
potential fix.