Linking update

This update's core feature is the linking between the eclipse workspace and your ArmA missions directory which should remove the great disadvantage this plugin had compared to already existing tools.

Changelog:

| Changed: A SQDevProject now contains a few more files (description.ext, link.sqdev)
| Changed: Working tasks now run in different thread
| Changed: SQF keywords are now case insensitive
| Changed: SQDevProjects create a mission.sqm file
| Changed: Created files are now in windows format ("\r\n" instead of "\n")
| Added: SQDevFile fileType
| Added: Linking preference category
| Added: Auto clean preference
| Added: Project wizard now has tooltips for every option
| Added: Import and Export wizards
| Added: More options when creating a SQDevProject
| Added: SQDev editor
| Fixed: Bug in the LayoutManager for the SQDevPreferencePage
| Fixed: Bug preventing a fileCreation in subFolders
| Fixed: Bug causing word parts getting highlighted as a keyword
| Fixed: Bug: Strings that end with a quotation mark are not colored properly