Mission DoChangeSpeed updated

Added extra parameters.
Setting default extension(.txt) when saving WP
Standard/Advanced Param View: Fix for components not being updated after initial connection and parameter request
Graph View: Proper fix for #432, lat/long were being handled as uint's. Also fixed a bug involving float parsing
Battery Monitor: Change of the battery monitor view
Graph View: Fix for bug causing duplicate removals/adding of graphs when a log is loaded
Mavlink Widget: Fix sort of MAVlink packets to be alphabetical in order
Configuration: APM Planner 2.0.15-rc1 release
Installer: Change for linux installer control file to have proper filename
Configuration: Update to JSON version object
resolving mission item MAV_CMD_DO_SET_CAM_TRIGG_DIST
resolving mission item MAV_CMD_NAV_SPLINE_WAYPOINT
improved "Camera by distance" description if disabled
waypoint list resolving MAV_CMD_DO_CHANGE_SPEED
Link Manager: Add prototype method for ‘remove link by id’
Comms Config: Fixes buttons in dialog showing connect/disconnect correctly

- Clean up commented out code from previous version
Map Widget: Make sure the Waypoint is fully constructed before firing waypointEditableChanged
Waypoint Widget: support spline waypoints

- delegate navigation between waypoints to WaypointNavigation.h
Mission Widget: Add spline waypoint
Waypoint Widget: refactor large methods from WaypointNavigation.h to WaypointNavigation.cc