Fix indenting and formatting according to the CMP.

Sorry for the big commit. There were so many indenting and formatting
issues in src/Fl_win32.cxx that I decided to reformat it with clang-format
(see previous commit). However, this commit is not the direct result
of using clang-format - I adjusted some parts of the code manually.

Other manual changes: I ...

 - reordered some #define's and added comments
 - added comments to switch/case/break statements and {} for clarity
 - moved a few 'break' statements inside or outside of braces {}

There should not be any code changes though, i.e. the compiled object
code should be identical.



git-svn-id: file:///fltk/svn/fltk/branches/branch-1.4@12599 ea41ed52-d2ee-0310-a9c1-e6b18d33e121