Added support for new search modes

The following new search modes have been implemented:
  * io.maps (old maps)
  * io.maprange (old mapsrange)
  * io.section (old section)
  * io.sections
  * io.sections.write
  * io.sections.exec
  * dbg.stack
  * dbg.heap
  * dbg.map
  * dbg.maps
  * dbg.maps.exec
  * dbg.maps.write