Remove $Id$ tags, update URL's, and more

- 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.

1 files changed, 3 insertions, 3 deletions

diff --git a/COPYING b/COPYING
index 954207522..de7016947 100644
--- a/COPYING
+++ b/COPYING
@@ -13,8 +13,8 @@ exceptions:
       The authors do request that such modifications be
       contributed to the FLTK project - send all contributions
       through the "Software Trouble Report" on the following page:
- 
-           http://www.fltk.org/str.php
+
+           https://www.fltk.org/bugs.php
 
     2. Widgets that are subclassed from FLTK widgets do not
        constitute a derivative work.
@@ -42,7 +42,7 @@ exceptions:
        documentation to satisfy this requirement:
 
            [program/widget] is based in part on the work of
-           the FLTK project (http://www.fltk.org).
+           the FLTK project (https://www.fltk.org).
 
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