* calcuculate curve path only when data has changed
* calculate spectrum analyzer only if signal input
* code clean up / coding conventions
* changes according coding guidelines/performance improvements in spectrum analyser/curves painting
* minor changes/white spaces
* change init order
* connect analyze view to gui->mainWindow()->periodicUpdate()
* consolidate some functions (d.r.y.)
* minor syntax changes
* fixes a right mouse button bug
* correct steepness of flanks in high and low pass filters
* Whitespaces
analyser now disabled when not in view.
band vu meters now disable when analyser is disabled.
display nema changed to Equalizer.
set sample rate before frequency on LinkWitzRiley filters.
Grouped the setting of filterparameters into one function, and calc coefficent
once if needed.
Made suitable function inline.
in and out vu meters now using both stereo channels
