First batch of GE API cleanup.

The principle is to replace most get/set methods of logic bricks by direct property access. 
To make porting of game code easier, the properties have usually the same type and use than
the return values/parameters of the get/set methods. 
More details on http://wiki.blender.org/index.php/GameEngineDev/Python_API_Clean_Up

Old methods are still available but will produce deprecation warnings on the console: 

"<method> is deprecated, use the <property> property instead"

You can avoid these messages by turning on the "Ignore deprecation warnings" option in Game menu.

PyDoc is updated to include the new properties and display a deprecation warning
for the get/set methods that are being deprecated.

source/gameengine/PyDoc/SCA_PropertyActuator.py

@@ -5,9 +5,17 @@ from SCA_IActuator import *
 class SCA_PropertyActuator(SCA_IActuator):
 	"""
 	Property Actuator
+
+	Properties:
+	
+	@ivar property: the property on which to operate.
+	@type property: string
+	@ivar value: the value with which the actuator operates.
+	@type value: string
 	"""
 	def setProperty(prop):
 		"""
+		DEPRECATED: use the 'property' property
 		Set the property on which to operate. 
 		
 		If there is no property of this name, the call is ignored.
@@ -17,12 +25,14 @@ class SCA_PropertyActuator(SCA_IActuator):
 		"""
 	def getProperty():
 		"""
+		DEPRECATED: use the 'property' property
 		Returns the name of the property on which to operate.
 		
 		@rtype: string
 		"""
 	def setValue(value):
 		"""
+		DEPRECATED: use the 'value' property
 		Set the value with which the actuator operates. 
 		
 		If the value is not compatible with the type of the 
@@ -32,6 +42,7 @@ class SCA_PropertyActuator(SCA_IActuator):
 		"""
 	def getValue():
 		"""
+		DEPRECATED: use the 'value' property
 		Gets the value with which this actuator operates.
 		
 		@rtype: string