test updates

- update main love readme to include note on tests
- added module tests for Sensor, Keyboard, Touch, Joystick, Mouse, and Love (for hooks + basic love-level methods)
- general clean-up of main class logic
- couple fixes for runner-specific failures (physics.Joint, audio.getActiveSourceCount, mouse.getPosition)
- change window.close test to run last

testing/conf.lua

@@ -5,20 +5,4 @@ function love.conf(t)
   t.window.height = 240
   t.window.resizable = true
   t.renderers = {"opengl"}
-  t.modules.audio = true
-  t.modules.data = true
-  t.modules.event = true
-  t.modules.filesystem = true
-  t.modules.font = true
-  t.modules.graphics = true
-  t.modules.image = true
-  t.modules.math = true
-  t.modules.objects = true
-  t.modules.physics = true
-  t.modules.sound = true
-  t.modules.system = true
-  t.modules.thread = true
-  t.modules.timer = true
-  t.modules.video = true
-  t.modules.window = true
 end