update .gitattributes

- force \n for code, testsets and config files

- disable newline handling for test inputs/outputs

- use system dependent line endings everywhere else
(keeps \r for files commited with \r endings)

.gitattributes

@@ -1,3 +1,13 @@
-/tests/config/** -text
-/tests/input/** -text
-/tests/output/** -text
+*                            text=auto
+
+tests/**                     -text
+
+src/**                       eol=lf
+scripts/**                   eol=lf
+
+tests/**/*.cfg               eol=lf
+
+tests/*.test                 eol=lf
+
+*.sh                         eol=lf
+*.bat                        eol=crlf