Update mapdata.cpp

Enabling search for room notes over map file.
Update mapdata.h

Enabling search for notes over mapfile.
Update findroomsdlg.cpp

Enabling search for notes over mapfile.
Update findroomsdlg.ui

Enabling search for notes over mapfile.
Merge pull request #1 from midoc/master

Merging a new note search feature coded by Arfang