Added quick Windows key test.
Added a program for performing various Windows dialog units calculations to test against the Layout page on MSDN. I'm guessing they never updated the Button entry for Segoe UI...
Fixed System font size reporting in windlgunits.c.
More updates to windlgunits.c. Consensus: the MSDN Layout page is unreliable.
Added the program to check Windows constants in Go package syscall - http://stackoverflow.com/questions/24022225/what-are-the-sign-extension-rules-for-calling-windows-api-functions-stdcall-t/24048495#24048495
Added a test program to experiment with making GtkMessageDialogs modal only to the window they are transient to and back to application-modal flawlessly.