Support Auto Hide Task Bars on Windows

[JeffryBooher]

This is for: adobe/brackets#7555
This replaces: #471

• Testing recommendations:

Place the task bar on:

1. Left
2. Top
3. Bottom
4. Right

Test with both auto hide and always visible.

This should be checked on Multiple Monitors as a fair amount of work went in to finding the right solution for multiple monitors.

• Make sure the Maximized size on a monitor without a task bar is the whole monitor
• Make sure the Maximized size on a monitor with a task bar that is not auto-hide works (top/left/bottom/right)
• Make sure that the Maximized size on both monitors is respected if the task bar is shown on all monitors (left/top/bottom/right)
• Make sure that the window adjusts itself when the app bar position or auto-hide flag changes while the app is running.
• Make sure that the size placement accommodates for a hidden Windows task bar if its state was not hidden when brackets saved the window placement data and is restarted with a hidden windows taskbar
• Make sure the app adjusts itself when changing the placement of the taskbar
• Make sure the app adjusts itself when changing the auto-hide state

You will notice a 1px area between the app and the taskbar. This is the taskbar and typical of all apps to give the taskbar an edge to grab. It IS more apparent with a dark border which gives the 1px line a little more contrast and makes it more visible.

[JeffryBooher]

@redmunds squashed and ready for merging. Thanks for the review!

[redmunds]

I'm still seeing this line indented with spaces and the rest of the function is indented with Tabs. I know there's a mix of spaces vs tabs in code base, and even in some files, but I think it should at least be consistent in each function/method.

[redmunds]

Sorry, for already saying it was ok to squash, but I realized that I didn't try all of the testing recommendations and I now notice a nasty bug:

1. Set taskbar on primary monitor (either show or auto-hide)
2. Drag Brackets window to secondary monitor and Maxmize

Results
Window is not correctly sized. Top and left are correct, but height is really short (~100px) and width is too wide. Upper-right buttons are off the screen -- need to double-click on header to Restore window.

UPDATE: This seems to be related to my secondary monitor setup (it's above primary). If I move secondary monitor to the right of primary and problem goes away. See screen shot for my setup:

Primary monitor resolution is 1920x1200

[redmunds]

@JeffryBooher I fixed the whitespace: 10e1378

[redmunds]

Merging.

[JeffryBooher]

@redmunds thanks for the review!