Add FullScreen support

[nreagan-nasa]

[RealDanTheMan]

@nreagan-nasa I believe you can already do this via the FullScreen="True" attribute on a window element

<DCAPP>
    <Window X="0" Y="0" Width="512" Height="512" ActiveDisplay="0" FullScreen="True">
        <Panel DisplayIndex="0" BackgroundColor="0 0 0" VirtualWidth="500" VirtualHeight="600">
            <String X="0" Y="0" HorizontalAlign="Left">FULLSCREEN EXAMPLE</String>
        </Panel>
    </Window>
</DCAPP>

[nreagan-nasa]

@RealDanTheMan That does work in legacy, but have not implemented in the dcapp-pl rework yet

[RealDanTheMan]

Right, I see - dcapp-pl is the future branch, exciting! Looking across the codebase the app side logic would be simple enough, but changes are also needed on the PL side to ensure each platform backend logic actually uses the fullscreen hint during window creation. Would you be open to PR on both?

[nreagan-nasa]

Go for it! A little guidance though-

For now I'd only implement it on the experimental release/debug builds of pilotlight, since those are what is used in dcapp, and the GLFW windowing of those already support fullscreen options

[RealDanTheMan]

Perfect, thanks for the heads-up!

[RealDanTheMan]

Pilotlight side portion of this work is pending review: PilotLightTech/pilotlight#144

[hoffstadt-nasa]

PL side work is complete and the DCApp code is updated to the new PL version. I'll let you guys workout the DCApp side of the feature.

Dan, I expanded your work to include alot of other changes we've been putting off. The fullscreen api looks like this on the PL side:

plFullScreenDesc tFullScreenDesc = {
    .iMonitor = 1,
    .tMode   = PL_FULLSCREEN_MODE_EXCLUSIVE;
};
gptWindows->set_fullscreen(ptWindow, &tFullScreenDesc);