Pathfinding and walking tests

[ivan-mogilko]

Walking / moving test:

• order object or character to move with certain speed
• loop with wait(1), and test that new position matches expectations on each game tick.
• for characters, optionally, test that new loop matches expectation (depends on dir).

Do this test for:

• room object moving along a straight horizontal, vertical and diagonal line (testing different speed ratios).
• character doing same.
• character walking along some path, testing that loops change as it turns.
  in ags4 this last test may be done using newest WalkPath command, but in ags3 we will need a walkable mask set properly to achieve different walking directions.

May do this for very short ranges to avoid test taking long time.
EDIT: or run with very high FPS (GameSpeed).