Show where each item starts in the inspiration and sync lists

Items in the inspiration list and the sync result columns now each have
their own background box, alternating between two shades, with a small
gap between them. When a long name wraps over several lines it is
still clear which lines belong together. The sync columns keep their
alternating white and orange text.

tests/unit/test_list_row.gd

@@ -0,0 +1,26 @@
+extends GdUnitTestSuite
+
+
+func _background(list_row: ListRow) -> Color:
+    return (list_row.get_theme_stylebox("panel") as StyleBoxFlat).bg_color
+
+
+func test_row_shows_text() -> void:
+    var list_row: ListRow = auto_free(ListRow.create("Chrono Trigger", 0, 20))
+
+    assert_str(list_row.text).is_equal("Chrono Trigger")
+
+
+func test_neighbouring_rows_have_different_backgrounds() -> void:
+    var first: ListRow = auto_free(ListRow.create("Chrono Trigger", 0, 20))
+    var second: ListRow = auto_free(ListRow.create("Chrono Cross", 1, 20))
+    var third: ListRow = auto_free(ListRow.create("Xenogears", 2, 20))
+
+    assert_that(_background(first)).is_not_equal(_background(second))
+    assert_that(_background(first)).is_equal(_background(third))
+
+
+func test_long_text_wraps() -> void:
+    var list_row: ListRow = auto_free(ListRow.create("Castlevania: Symphony of the Night", 0, 20))
+
+    assert_int(list_row.label.autowrap_mode).is_equal(TextServer.AUTOWRAP_WORD_SMART)