[graphics.mod] TGraphics.Resize() and .Position() only stubs

[GWRon]

No backend for now implements Resize() or Position().

	Method Resize(width:Int, height:Int) Override
	End Method
	
	Method Position(x:Int, y:Int) Override
	End Method

So for now there is no way to reposition/resize a windowed Blitzmax-window in a convenient way - despite directly on creation via graphics()

[GWRon]

For Linux we could position like this:
glgraphics.mod/glgraphics.linux.c:

void bbGLGraphicsPosition( int x, int y ){
	if( !_currentContext ) return;
	if( !xdisplay ) return;

	XMoveWindow(xdisplay, _currentContext->window, x, y);
}

glgraphics.mod/source.bmx:

Extern
...
	Function bbGLGraphicsPosition( x:Int, y:Int )


Type TGLGraphics Extends TGraphics
...
	Method Position(x:Int, y:Int) Override
		bbGLGraphicsPosition(x, y)
	End Method

[GWRon]

Windows:
glgraphics.mod/glgraphics.win32.c

void bbGLGraphicsPosition( int x, int y ){
	if( !_currentContext ) return;
	//ignore when in fullscreen
	if( _currentContext->depth != 0) return;

	RECT rect={0,0,0,0};
	rect.left = x + GetSystemMetrics(SM_CXBORDER);
	rect.top = y + GetSystemMetrics(SM_CYCAPTION) + GetSystemMetrics(SM_CYFIXEDFRAME);
	rect.right = rect.left + _currentContext->width;
	rect.bottom = rect.top + _currentContext->height;
		
	//same style as in "bbGLGraphicsCreateGraphics()"
	int hwnd_style = WS_CAPTION|WS_SYSMENU|WS_MINIMIZEBOX;
	
	//calculate new area rect incorporating window styling
	AdjustWindowRectEx( &rect, hwnd_style, 0, 0 );
	
	//adjust position
	SetWindowPos(_currentContext->hwnd, NULL, rect.left, rect.top, rect.right - rect.left, rect.bottom - rect.top, SWP_NOZORDER);

	//refresh dimensions
	RECT newRect;
	GetClientRect( _currentContext->hwnd, &newRect );
	_currentContext->width = newRect.right - newRect.left;
	_currentContext->height = newRect.bottom - newRect.top;
}