Trigger controls update by a timer to improve dragging performance

On some plateform( for example my low powered netbook windows 8.1 )
dragging when grib_pi is running is slowed down by controld update
triggered directly by "setCursorLatLon" function.
To improve that, I propose to use a timer. That off course delays
the update by a few milliseconds, but should not be visible even on a
hight powered device
Remove unused variables
Improve OpenGL rendering of highlited Routes and Marks
Improve Touch screen interface user dynamics.
Correct navobj changes logic for added/deleted RoutePoints
Merge pull request #149 from Ptizef/master

Trigger controls update by a timer to improve dragging performance
Merge branch 'master' of github.com:OpenCPN/OpenCPN
In touch tablet mode, disable long touch one selected object.
Improve / correct Rounded rectangle drawing on OpenGL
Improve Routepoint highlite on OpenGL
in Touch tablet mode, disallow multiple Routepoint selection.
Bugfix for FS#1318
Merge pull request #150 from tom-r/master

Bugfix for FS#1318
Improve Chart database lookup performance
Show informational dialog when a PlugIn fails to load, and is Blacklisted.
Blacklist s63_pi Version 0.6 and below for Mac OSX.
Correct S57 ENC Object Query font selection
Correct ChartSymbols loading logic for DCMode rendering.
Language file update
Correct various potential runtime errors flagged by Xcode analysis.