Script tests re-added, all tests can run under gdb

Also fixed a minor bug with printing, and removed the ability to
configure the parser.

Added and updated QUICKSTART.md as a quick way to get people started.

There's some broken scripts under 'scripts/' that require functions to
work properly.

tests/scripts/test_keyword_assert.toy

@@ -0,0 +1,13 @@
+//NOTE: these tests are all passing - failing tests can be found under the 'mustfails' directory
+
+//basic assert statement
+assert true;
+
+//assert on a string (tests for it's truthiness)
+assert "Hello world";
+
+//assert on a condition
+assert 1 < 2;
+
+//assert with an optional message
+assert true, "Assertion message";