Add support for Aero Snapping

[VolatilePulse]

Provides consistent control positioning by referencing client area instead of form area
Removed unnecessary WndProc code for resizing due to changes
Minimal code cleanup

Fixes maximize bug that allowed "drifting" of the window
Fixes maximize bug that prevented the form from being maximized on a second monitor
Fixes maximize bug that required the program to be maximized prior to snapping maximized

[orapps44]

Thank you @VolatilePulse for this great work.

This code properly fix #84 #215 #219

[orapps44]

@VolatilePulse : This PR seems to be root cause of issue #227.
Any idea what could be wrong ?

[VolatilePulse]

Yeah, I just noticed that last night but couldn't identify the cause of the issue. This helps me narrow down what's causing it and allow me to work on a solution. Unfortunately, I'll be out of town until next week.

Edit:
Additionally, my testing only increased the form size by 7 pixels per side, increasing it by 14px width and height. It's interesting to see they're experiencing twice that value.

[orapps44]

It seems to be related with WS_SIZEFRAME.

Issue is solved when WS_SIZEFRAME is removed from :

  par.Style = par.Style | WS_MINIMIZEBOX | WS_SYSMENU | WS_SIZEFRAME; // Turn on the WS_MINIMIZEBOX style flag

But without WS_SIZEFRAME, aero snap doesn't work ...

[VolatilePulse]

For the time being, this code will suffice for the designer. I'll have to do more investigating once I'm back as information is very limited.

        protected override CreateParams CreateParams
        {
            get
            {
                var par = base.CreateParams;
                par.Style |= WS_MINIMIZEBOX | WS.WS_SYSMENU;

                if (!DesignMode)
                    par.Style |= WS_SIZEFRAME;

                return par;
            }
        }

Edit:
This issue appears to actually be caused by the WM_NCCALCSIZE message just being discarded at the moment. Once I have time to play around with the code and do some testing, I'll release a fix for this.
https://docs.microsoft.com/en-us/windows/win32/winmsg/wm-nccalcsize

[orapps44]

Hi @VolatilePulse ,

Bug mentioned in #243, seems to be a side effect of this PR.