reverse some of the public-domain-license changes that I didn't

actually want

stb.h

@@ -1,4 +1,5 @@
 /* stb.h - v2.24 - Sean's Tool Box -- public domain -- http://nothings.org/stb.h
+          no warranty is offered or implied; use this code at your own risk
 
    This is a single header file with a bunch of useful utilities
    for getting stuff done in C/C++.

stb_image.h

@@ -1,4 +1,5 @@
 /* stb_image - v2.06 - public domain image loader - http://nothings.org/stb_image.h
+                                     no warranty implied; use at your own risk
 
    Do this:
       #define STB_IMAGE_IMPLEMENTATION

stb_image_write.h

@@ -1,6 +1,6 @@
 /* stb_image_write - v0.98 - public domain - http://nothings.org/stb/stb_image_write.h
    writes out PNG/BMP/TGA images to C stdio - Sean Barrett 2010
-
+                                     no warranty implied; use at your own risk
 
    Before #including,
 

stb_tilemap_editor.h

@@ -1,5 +1,5 @@
 // stb_tilemap_editor.h - v0.35 - Sean Barrett - http://nothings.org/stb
-// first released 2014-09
+// placed in the public domain - not copyrighted - first released 2014-09
 //
 // Embeddable tilemap editor for C/C++
 //