Ftpc: Update (#185)

- fix for bugs with buffers 'remote_list_buf', 'buf_buffer2';
- fix stack leak when navigating files;
- change sorting of folders and files, clean code;
- added option to show|hide log;
- icons are taken from @reshare;
- added icons to the 'disconnect' and 'search' buttons.

Reviewed-on: #185
Reviewed-by: Max Logaev <maxlogaev@proton.me>
Co-authored-by: IgorA <aie85playm@gmail.com>
Co-committed-by: IgorA <aie85playm@gmail.com>

data/Tupfile.lua

@@ -49,8 +49,6 @@ img_files = {
  {"MEDIA/IMGF/INVSOL.OBJ", "common/media/ImgF/invSol.obj"},
  {"MEDIA/PIXIESKN.PNG", SRC_PROGS .. "/cmm/pixie2/pixieskn.png"},
  {"NETWORK/FTPC.INI", SRC_PROGS .. "/network/ftpc/ftpc.ini"},
- {"NETWORK/FTPC_SYS.PNG", SRC_PROGS .. "/network/ftpc/ftpc_sys.png"},
- {"NETWORK/FTPC_NOD.PNG", SRC_PROGS .. "/network/ftpc/ftpc_nod.png"},
  {"NETWORK/FTPD.INI", "common/network/ftpd.ini"},
  {"NETWORK/KNMAP", "common/network/knmap"},
  {"NETWORK/USERS.INI", "common/network/users.ini"},