- remove obsolete svn '$Id$' tags from all source files
- update .fl files and generated files accordingly
- replace 'http://www.fltk.org' URL's with 'https://...'
- replace bug report URL 'str.php' with 'bugs.php'
- remove trailing whitespace
- fix other whitespace errors flagged by Git
- add and/or fix missing or wrong standard headers
- convert tabs to spaces in all source files
The only relevant code changes are in the fluid/ folder where
some .fl files and other source files were used to generate
the '$Id' headers and footers.
Refer to discussion if fltk.general, thread "Drag and drop issue"
in August September 2017.
git-svn-id: file:///fltk/svn/fltk/branches/branch-1.4@12432 ea41ed52-d2ee-0310-a9c1-e6b18d33e121
