Add option to highlight all words matching the current selection
Use SynchronizingObject for the Timer
Color utils added...
Minor tweaks...
Fixes and improvements

- removed Ctrl+DoubleClick option
- fixed "CurrentSelection" mode when selection length == 0
- added SelectedWord mode
- renamed CurrentSelection to SelectionOrPosition
Merge pull request #464 from Gama11/HighlightSelection

Add option to highlight all words matching the current selection
Minor refactoring...