develop/libraries/box_lib: Post-SVN tidy

- Move source code from `trunk` into program root directory.
- Update build files and ASM include paths.
- Note: Line endings standardised from `CRLF` > `LF`, so best to view diffs with whitespace changes hidden.

programs/develop/heed/heed.asm

@@ -69,7 +69,7 @@ include	'lang.inc'      ; Language support for locales: ru_RU (CP866), en_US.
 include '../../KOSfuncs.inc'
 include '../../config.inc'		; for nightbuild
 include '../../macros.inc'
-include	'../libraries/box_lib/trunk/box_lib.mac'
+include	'../libraries/box_lib/box_lib.mac'
 include	'../../load_lib.mac'
 
 @use_library