fixed peak find slow speed
fixed peak find error when window is out of range of the spectrum
removed min/max function on data_range
small optimization fixes
added peak left/right buttons
Merge branch 'master' into peak_left_right
Merge remote-tracking branch 'mfarhan/fix_peak_find'
Merge branch 'master' into peak_left_right
began implementing functions that peak left/right
fixed opening discovery window pausing plot
Fixed Auto mode duplication
disabled playback controls, need to be better tested
renamed CF to marker label
Revert "disabled playback controls, need to be better tested"

This reverts commit cac3b7fc358c033ae46a4e18158a05bfc071e506.
fixed reference to deprecated value
implemented peak left/right functionality
Merge branch 'master' into peak_left_right
move DSP menu creation to MainWindow
define dsp menu with a list
developer options menu