Client cleanup and restructuring. Stage 1...

Next Step is refactoring some of the giant functions which are
just copy/paste of some other ones with just a few line changes,
removing unnecessary 'goto' etc.

The MS Windows version is broken with this commit but will be fixed
soon. Everything can't be done all at once :P

The commands are now hierarchical, for example:
"hf 14a read" vs. "hf 14b read".
You can also request help:
"hf help", "data help", "hf 15 help" etc.

Indents are now space-based, not tab-based anymore. Hopefully
no one will be trolling about it, considering the suicide-prone work
being done here ;)

client/cmdhw.c, client/proxusb.c, client/cmdhw.h, client/proxusb.h,
client/cmdmain.c, client/cmdlfhid.c, client/cmdmain.h, client/cmdlfhid.h,
client/data.c, client/data.h, client/cmdhf.c, client/cmdlf.c,
client/cmdhf.h, client/cmdhf15.c, client/cmdhf14b.c, client/cmdlf.h,
client/cmdhf15.h, client/cmdhf14b.h, client/cmddata.c, client/cmddata.h,
client/ui.c, client/cmdparser.c, client/cmdlfti.c, client/ui.h,
client/cmdlfem4x.c, client/cmdparser.h, client/cmdlfti.h, client/cmdlfem4x.h,
client/graph.c, client/graph.h, client/cmdhf14a.c, client/cmdhf14a.h,
client/cmdhflegic.c, client/cmdhflegic.c: New files.

client/cli.c, client/flasher.c, client/snooper.c, client/proxmark3.c,
client/proxmark3.h, client/Makefile: Update accordingly.

client/flash.h, client/flash.c, client/proxgui.cpp: Cosmetic changes.

client/translate.h, client/command.c, client/gui.c,
client/usb.c, client/prox.h: Remove.

include/usb_cmd.h (CMD_ACQUIRE_RAW_ADC_SAMPLES_ISO_14443_SIM): Remove dead cmd.

common/crc16.h: New file.
common/crc16.c: Modify accordingly.
common/iso14443crc.h: New file.
common/iso14443_crc.c: Rename to
common/iso14443crc.c: and modify accordingly.

armsrc/lfops.c, armsrc/iso14443.c,
armsrc/iso14443a.c: include .h files from
the common directory instead of including the c files.

common/Makefile.common, armsrc/Makefile: Modify accordingly.