x86_64: added agp_gart, intel_gart, intel_extreme to the image.

* tested on Intel GM45 and Atom_N4x0
intel_extreme: don't expose overlay in accelerant when not allocated

... in the driver.
Debugger: add settings manager for source location mappings.

- If it was necessary to help the debugger locate a particular source
  file due to it not being found on disk at the location specified in
  the debug information, the associated user-supplied path mappings
  are now saved and restored in the team settings. The file manager still
  needs a bit of extra work to apply these as files are added though.
Fix incorrect name usage.
Debugger: Implement #9961.

- FileManager now saves any explicitly located file mappings,
  and properly restores them when reloading the same team/files later.