Icons not present/hardcoded

A bunch of XPM icons are hardcoded, in pixmapchooser.cpp, for example:

PixmapChooser::PixmapChooser()
{
    // #### hardcoded at the moment
    miniPixDir = "../pics/mini/";
    noSizePixDir = "../pics/";
    smallPixDir = "../pics/small/";
    largePixDir = "../pics/large/";
}

These really shouldn't be hardcoded. Working on figuring out how best to allow these locations to be changed.

Also need to get meson.build to copy these in so they are even present to begin with.

Edit to add: This is in Designer