Get rid of the "wm_" prefix on module names... it was a stupid idea

[dougthor42]

I'm regretting the wm_ prefix on module names. I want to change things to:

• wm_app -> app
• wm_constants -> constants
• wm_core -> panel, core (note this actually splits into 2 modules)
• wm_frame -> frame
• wm_info -> wafer_info
• wm_legend -> legend
• wm_utils -> utils

Of course, I'll need to keep the old names for backwards compatibility. I'll also have to mark them as pending deprecation.