Remove references to SWT from classes that are moving to ide-common.

Remove references to SWT from classes that are moving to ide-common.

- Move the SWT based getIcon from the resource qualifier and use a static
  helper instead.

- Make a new enum ResourceDeltaKind to replace the IResourceDelta
  integer constants, and use the same helper class to convert from
  one to the other.

- Make ResourceRepository exclusively use the IAbstractFile/Folder

- Use the ILogger in place of AdtPlugin (which implements ILogger)

Change-Id: I0011c01ac2064b07d28c980112c47cfa433ee372