first go at some notepad changes

[Jonathan Wilson]

> Do not send bogus WM_SIZE messages, use SetWindowPos instead. Remove
> iStatusBarHeight from globals and use IsWindowVisible and GetWindowRect
> when you need to take into account status bar size.

 From looking at microsoft examples, said examples send WM_SIZE to the 
status bar and let it reposition itself.

And also, said examples store the status bar height for later use 
(presumably because calling IsWindowVisible and GetWindowRect multiple 
times is slower than saving it and reusing it later)

I dont know if there is one example that does both things but I do know 
that both things are done by microsoft example code.