rs-met updates EngineersFilter and EasyQ

rs-met has updated the free EngineersFilter and EasyQ plug-ins.

EasyQ is a maintenance update with a little bug fix related to color scheme handling.

EngineersFilter now includes two new approximation methods: Bessel and Papoulis. The Bessel design approximates a linear phase response in its pass-band and the Papoulis design achieves the maximum negative slope at the cutoff frequency when a monotonically decreasing magnitude response is assumed.