develop/libraries/box_lib: Post-SVN tidy

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

contrib/C_Layer/ASM/loadboxlib.asm

@@ -1,3 +1,7 @@
+; SPDX-License-Identifier: NOASSERTION
+;
+
+
 format coff
 use32                                   ; Tell compiler to use 32 bit instructions
 
@@ -7,7 +11,7 @@ include '../../../programs/proc32.inc'
 include '../../../programs/macros.inc'
 purge section,mov,add,sub
 
-include '../../../programs/develop/libraries/box_lib/trunk/box_lib.mac'
+include '../../../programs/develop/libraries/box_lib/box_lib.mac'
 include '../../../programs/system/run/trunk/txtbut.inc'
 include '../../../programs/dll.inc'
 
@@ -159,8 +163,8 @@ public path_show_draw as '_path_show_draw'
 
 public fb_draw_panel as '_filebrowse_draw'
 public fb_mouse as '_filebrowse_mouse'
-public fb_key as '_filebrowse_key'
-
+public fb_key as '_filebrowse_key'
+
 public ted_but_sumb_upper as '_ted_but_sumb_upper'
 public ted_but_sumb_lover as '_ted_but_sumb_lover'
 public ted_but_convert_by_table as '_ted_but_convert_by_table'