[Paraview] add buttons with custom filter and assign key binding

[Fabian Braennstroem]

Hi,

I have some questions to the gui handling :-)

Is there an option to add custom filters as buttons in the menu bar?
And is it possible to place custom filter into the 'common' subdirectory?
Are there plans for the future to allow some keybinding settings for the 
user?

Best!
Fabian