[window-state] Use macOS window state autosave API

[probablykasper]

Currently, the window state is stored in a .window-state file. macOS provides an API to automatically store the window state in defaults.
NSWindow setFrameAutosaveName

When I run defaults read com.apple.calculator I get these values:

{
    LCDStringValueKey = "0.0000000000000000";
    "NSWindow Frame Calc_History_Window" = "653 991 227 342 0 0 2560 1417 ";
    "NSWindow Frame Calc_Main_Window" = "511 294 232 321 0 0 2560 1417 ";
    ViewDefaultsKey = Basic;
    ViewPathDefaultsKey = "##BUILTIN##/BasicAndSci.calcview";
}