Exercise 26 -- Add callback function enhancement

[mayurdhepe]

The exercise would be similar to Ex 25, there would be an additional enhancement to support callback function as we have for Ex 18 where we should be able to control various params of the signals (com links).

[mayurdhepe]

Get rid of the sliders for the new exercise. And for previous exercises - Keep sliders for Ex 16, remove for every other exercise that has callback params.

[mayurdhepe]

Include Interference options - Non-interferer, interferer, Radar Pu, Comms PU.
Interferer would have its own callback function.
Ability to minimize callback text areas (save screen space).

[mayurdhepe]

Limit the center frequencies of PSD plot, within the plot area.
Minimize the args table.
Change labels for Function Callbacks - Interferer Controller and Signal Controller.

Add one more SINR calc option for preselector filter bdw occupying the enter freq range (for each signal).

[mayurdhepe]

Constrain the center frequency such that it is within --
sig_freq > freq_min + (bandwidth/2)
sig_freq < freq_max - (bandwidth/2)

The pre-selector should be fixed across the entire freq range (and not centered around the signal freq) -- last mode.

Add this mode to Ex 26.

[mayurdhepe]

Remove the Non-ideal filter from dropdown list.