Add more 'pose' related functions (#1567)

* Add more pose related functions

* Rename 'id' to 'pose' in 'getPoseRange' docs

* Make 'getPoseRange' only accept number parameter

* Rename 'pose' to 'id' and small doc fix

lua/starfall/libs_sh/entities.lua

@@ -1379,6 +1379,34 @@ function ents_methods:getPose(pose)
 	return getent(self):GetPoseParameter(pose)
 end
 
+--- Returns the amount of pose parameters the entity has
+-- @return number Amount of poses
+function ents_methods:getPoseCount()
+	return getent(self):GetNumPoseParameters()
+end
+
+--- Returns pose index corresponding to the given name
+-- @param string pose Pose name
+-- @return number Pose index or -1 if not found
+function ents_methods:getPoseIndex(pose)
+	return getent(self):LookupPoseParameter(pose)
+end
+
+--- Returns pose name corresponding to the given index
+-- @param number id Pose index (starting from 0)
+-- @return string Pose name or empty string if not found
+function ents_methods:getPoseName(id)
+	return getent(self):GetPoseParameterName(id)
+end
+
+--- Returns pose value range
+-- @param number id Pose index (starting from 0)
+-- @return number? Minimum pose value or nil if pose not found
+-- @return number? Maximum pose value or nil if pose not found
+function ents_methods:getPoseRange(id)
+	return getent(self):GetPoseParameterRange(id)
+end
+
 --- Returns a table of flexname -> flexid pairs for use in flex functions.
 -- @return table Table of flexes
 function ents_methods:getFlexes()