Improve `odin test`.

[Kelimion]

odin test presently prints Tests failed: 1 (without a newline) on non-Windows platforms, instead of the more elaborate:

[Package: test]
[Test: trivial_test]
W:/Odin-other/Odin-test/test.odin(246:13): 1 does not equal 2.
[trivial_test : FAILURE]

In addition, on these platforms it also fails to print that assertion that 1 does not equal 2.

Lastly, let's allow -out to work for odin test.