This PR refactors the Read Mind power to make it much more interactive
with differing levels of Psi-sensitivity. I also fixed issues with
improper sanitization of its inputs by just gently reworking it to use
the modern tgui_input_text(). It no longer has a hardcoded check for the
psi-receiver, since that check has long since been deprecated in favor
of the more modular check_psi_sensitivity().
I needed Hyperbolic Tangent for what I was doing here, so I just added
procs for all the Hyperbolic functions. They exist. Have fun.
VMSolidus
20bf497ee8