Renamed test files to match pattern from src

Also, started setup for testing do_remove and introduced a bit of shorthand macros.

src/test/test.act.item.c

@@ -0,0 +1,15 @@
+#include "test.act.item.h"
+
+UNIT_TEST(test_do_remove) {
+
+
+
+    return MUNIT_OK;
+}
+
+MunitTest act_item_c_tests[] = {
+    STD_TEST("/do_remove", test_do_remove),
+  
+    // end of array marker
+    { NULL, NULL, NULL, NULL, MUNIT_TEST_OPTION_NONE, NULL }
+};