[cooja] plugins/VariableWatcher: Added @Override annotations
[cooja] plugins/VariableWatcher: Added Combo as name suffix for JComboBoxes
[cooja] plugins/VariableWatcher: Enums for ComboBoxes and new one for display format

Allows to choose between var types (byte, short, int, long) and display
types (char, decimal, hex)
[cooja] plugins/VariableWatcher: Implemented formatted output for value fields
[cooja] plugins/VariableWatcher: Replace varName KeyListener by DocumentListener as only content changes change validation state of varName
Modify foreground color of varName instead of background color because some LookAndFeels do not support colored backgrounds.
[cooja] plugins/VariableWatcher: Remove charValuePane and reimplement read functionality and more
[cooja] plugins/VariableWatcher: Fixed xml config save/load
[cooja] plugins/VariableWatcher: implemented monitoring, writing; fixed various issues
[cooja] plugins/VariableWatcher: Added address and and size labels
to display information about currently selected variable
[cooja] plugins/VariableWatcher: Added 'line break' for byte text fields
Adds new line each 8 text fields
[cooja] plugins/VariableWatcher: Added swingx library to provide autocomplete support for variable names combobox in plugins/VariableWatcher
[cooja] plugins/VariableWatcher: Added Tooltip that shows address, added address variable type, fixed columns width layout
[cooja] plugins/VariableWatcher: fixed handling of unknown variable sizes
[cooja] plugins/VariableWatcher: Replaced obsolete Vector by ArrayList
[cooja] plugins/VariableWatcher: Allow to access memory by address/size

By selecting the checbox next to the address field, VariableWatcher
switches from variable mode to address mode.
Now any address and size might be entered to show data from memory.

Additionally for variables where now size information is available the
interface allows the user to select one.
[cooja] plugins/VariableWatcher: Catch exceptions, show error dialog for invalid addresses
And some gui option handling fixes
[cooja] plugins/VariableWatcher: Fixes for value layout

- Fixed layout axis form x to page to show multi-line value fields.
- More flexible width calculation for value fields
[cooja] plugins/VariableViewer: Fix decoding in stringToValue()
[cooja] plugins/VariableWatcher: Also disble addr and size input fields when monitoring
[cooja] plugins/VariableWatcher: Added minimal quick help