Add standard ROS message definitions

Add comprehensive collection of message definitions for core ROS
packages including actionlib_msgs, diagnostic_msgs, geometry_msgs,
nav_msgs, pcl_msgs, rosgraph_msgs, sensor_msgs, shape_msgs,
std_msgs, stereo_msgs, tf2_msgs, trajectory_msgs, and
visualization_msgs.

Author: PatWie

messages/actionlib_msgs/msg/GoalID.msg

@@ -0,0 +1,10 @@
+# The stamp should store the time at which this goal was requested.
+# It is used by an action server when it tries to preempt all
+# goals that were requested before a certain time
+time stamp
+
+# The id provides a way to associate feedback and
+# result message with specific goal requests. The id
+# specified must be unique.
+string id
+

messages/actionlib_msgs/msg/GoalStatus.msg

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+GoalID goal_id
+uint8 status
+uint8 PENDING         = 0   # The goal has yet to be processed by the action server
+uint8 ACTIVE          = 1   # The goal is currently being processed by the action server
+uint8 PREEMPTED       = 2   # The goal received a cancel request after it started executing
+                            #   and has since completed its execution (Terminal State)
+uint8 SUCCEEDED       = 3   # The goal was achieved successfully by the action server (Terminal State)
+uint8 ABORTED         = 4   # The goal was aborted during execution by the action server due
+                            #    to some failure (Terminal State)
+uint8 REJECTED        = 5   # The goal was rejected by the action server without being processed,
+                            #    because the goal was unattainable or invalid (Terminal State)
+uint8 PREEMPTING      = 6   # The goal received a cancel request after it started executing
+                            #    and has not yet completed execution
+uint8 RECALLING       = 7   # The goal received a cancel request before it started executing,
+                            #    but the action server has not yet confirmed that the goal is canceled
+uint8 RECALLED        = 8   # The goal received a cancel request before it started executing
+                            #    and was successfully cancelled (Terminal State)
+uint8 LOST            = 9   # An action client can determine that a goal is LOST. This should not be
+                            #    sent over the wire by an action server
+
+#Allow for the user to associate a string with GoalStatus for debugging
+string text
+

messages/actionlib_msgs/msg/GoalStatusArray.msg

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+# Stores the statuses for goals that are currently being tracked
+# by an action server
+Header header
+GoalStatus[] status_list
+

messages/diagnostic_msgs/msg/DiagnosticArray.msg

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+# This message is used to send diagnostic information about the state of the robot
+Header header #for timestamp
+DiagnosticStatus[] status # an array of components being reported on

messages/diagnostic_msgs/msg/DiagnosticStatus.msg

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+# This message holds the status of an individual component of the robot.
+# 
+
+# Possible levels of operations
+byte OK=0
+byte WARN=1
+byte ERROR=2
+byte STALE=3
+
+byte level # level of operation enumerated above 
+string name # a description of the test/component reporting
+string message # a description of the status
+string hardware_id # a hardware unique string
+KeyValue[] values # an array of values associated with the status
+

messages/diagnostic_msgs/msg/KeyValue.msg

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+string key # what to label this value when viewing
+string value # a value to track over time

messages/geometry_msgs/msg/Accel.msg

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+# This expresses acceleration in free space broken into its linear and angular parts.
+Vector3  linear
+Vector3  angular

messages/geometry_msgs/msg/AccelStamped.msg

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+# An accel with reference coordinate frame and timestamp
+Header header
+Accel accel

messages/geometry_msgs/msg/AccelWithCovariance.msg

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+# This expresses acceleration in free space with uncertainty.
+
+Accel accel
+
+# Row-major representation of the 6x6 covariance matrix
+# The orientation parameters use a fixed-axis representation.
+# In order, the parameters are:
+# (x, y, z, rotation about X axis, rotation about Y axis, rotation about Z axis)
+float64[36] covariance

messages/geometry_msgs/msg/AccelWithCovarianceStamped.msg

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+# This represents an estimated accel with reference coordinate frame and timestamp.
+Header header
+AccelWithCovariance accel