remove unused SvxFmConfigWin class

Change-Id: Ic3c7e508ba80935e938f9fc73ddcc50367ac0c4e
remove dead SvxDialogDll class

Change-Id: Ibf923575f48b2e253dee5a83c317e17d3fb68b0c
remove some useless lines

As those classes don't exist.

Change-Id: I1e9015e1654e6d261709ab0b1dcf9784a0849e92
remove unused AbstractSvxMultiFileDialog class

Change-Id: If364717007e1820a314ae6f66ae33d9f6a91e84f
remove unused AbstractSvxSearchFormatDialog class

Change-Id: I34d52580319c692920921dadd1c4d0a80f457e68
remove uncompiled source files

how to find possible candidates:

find . -name *.cxx | grep -v compilerplugins > cxx.list
for i in `cat cxx.list`; do basename $i .cxx; done > cxx.base.list
for i in `cat cxx.base.list | sort -u`; do echo $(git grep -w $i -- '*.mk' | wc -l) $i; done > cxx.count

Change-Id: I15c6cc7195e58d79967388850a0c90b915b001b7