Fixed the maximized option on the newer Minecraft versions

[Trial97]

fixes #181
closes #292
Works on my machine but I would want to test it against other platforms
This doesn't really start it in maximized mode but just sets the game width and height to the maximum possible value.
Warning I'm entirely sure that java.awt stuff is in the default java installation(I haven't worked with java for a long time)

[TayouVR]

at least on my windows this makes it the right size, but the window title is outside of my monitor. :/

[Trial97]

Do you have more than one monitor?
The gap at the bottom is for the taskbar I think.

[Trial97]

With the latest commit the decoration size should also be taken into consideration.
Small warning the position of the window can't be controlled.

[TayouVR]

Do you have more than one monitor? The gap at the bottom is for the taskbar I think.

I have 3 monitors, though the size of the gap is the size of the window title bar. The task bar is about twice that size.
I will have a look at the latest build ^^

[TayouVR]

Can we set the window position somehow?
If so; then we could fix this, by just shifting it down.
But at least I can reach the titlebar now, so its not too bad. Better than not changing the size at all.

Though changing the window position would reach into ugly platform specific APIs and code.. :/

[Trial97]

I can't control the window at all (size being the exception as we have some arguments for it) so the position change I believe is something not for this PR(maybe possible but I will not worry about it).
Also just to make sure that this is treated as a hack I added a big yellow warning(permanent on global settings; conditional on the instance settings)

[TheKodeToad]

Warning I'm entirely sure that java.awt stuff is in the default java installation(I haven't worked with java for a long time)

I assume you mean you're not entirely sure. It should be available, but in newer Minecraft versions (with LWJGL3) I'm pretty sure it causes some big problems!

[Trial97]

Do not worry I removed that in favor of some c++ code that does the same thing but a little better: 0cab57c
I just forgot to update the original PR message.
Right now all I do on this PR is as follows:

• using QT try to determine the size of the screen( this is not guaranteed to get me the right values)
• pass the calculated size to java launcher
• in the launcher just pass that to Minecraft

The only reason I opted to also add a warning on the checkbox is because in theory even if the surface of the game is expanded at maximum(similar to how maximized would work) is not maximized.
The only change to the java code is the removal of maximized check for newer version(and passing the dimensions directly)