Allow target name subdirectory for install files and handle symlinks

[excaliburtb]

Is your feature request related to a problem? Please describe.
Just need to add to the paths of locations for the install list from TGT_FILELIST the possibility of target_defs/<TGT_NAME>/

Also, if the file is a symlink, it needs to be followed to its source but copied as the name in FILELIST suggests.

Describe the solution you'd like

    foreach(INSTFILE ${TGT${TGTID}_FILELIST})
      if(EXISTS ${MISSION_DEFS}/${TGTNAME}/${INSTFILE})
        set(FILESRC ${MISSION_DEFS}/${TGTNAME}/${INSTFILE})
      elseif(EXISTS ${MISSION_DEFS}/${TGTNAME}_${INSTFILE})
        set(FILESRC ${MISSION_DEFS}/${TGTNAME}_${INSTFILE})
      elseif(EXISTS ${MISSION_DEFS}/${INSTFILE})
        set(FILESRC ${MISSION_DEFS}/${INSTFILE})
      else()
        set(FILESRC)
      endif()
      if (FILESRC)
        get_filename_component(_resolvedFile "${FILESRC}" REALPATH)
        install(FILES ${_resolvedFile} DESTINATION ${TGT_NAME}/${INSTALL_SUBDIR} RENAME ${INSTFILE})
      else(FILESRC)
        message("WARNING: Install file ${INSTFILE} for ${TGTNAME} not found")
      endif (FILESRC)
    endforeach(INSTFILE ${TGT${TGTID}_FILELIST})

Something like that maybe?

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Additional context
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Requester Info
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[skliper]

@excaliburtb Do you need this in Caelum?

[excaliburtb]

It would be really nice if it made it.