passing height to the measure function

This diff:
* adds height as another parameter passed to the measure function, computed the same way width is
* adds tests for this extension, which has involved adding a new measure function to all of js, c, java and c# tests

src/Layout-test-utils.h

@@ -13,6 +13,6 @@
 
 void test(const char *name, css_node_t *style, css_node_t *expected_layout);
 int tests_finished(void);
-css_dim_t measure(void *context, float width);
+css_dim_t measure(void *context, float width, float height);
 void init_css_node_children(css_node_t *node, int children_count);
 css_node_t *new_test_css_node(void);