Remove legacy networking code

[SZAVAI Gyula]

[PATCH setup 1/5] Remove direct(legacy) connection type
[PATCH setup 2/5] Rename IDC_NET_IE5 to IDC_NET_PRECONFIG
[PATCH setup 3/5] Remove NetIO_File
[PATCH setup 4/5] Add Proxy class
[PATCH setup 5/5] Remove NetIO_HTTP

 ConnectionSetting.cc |  11 ++---
 Makefile.am          |   6 ---
 net.cc               |  17 +++----
 netio.cc             |  42 ++++-------------
 nio-file.cc          |  64 --------------------------
 nio-file.h           |  31 -------------
 nio-ftp.cc           | 179 ------------------------------------------------------------------------
 nio-ftp.h            |  41 -----------------
 nio-http.cc          | 208 ------------------------------------------------------------------------------------
 nio-http.h           |  39 ----------------
 nio-ie5.cc           |  89 +++++++++++++++++++++++++++++-------
 nio-ie5.h            |   2 +-
 res.rc               |   4 +-
 resource.h           |   3 +-
 14 files changed, 96 insertions(+), 640 deletions(-)