.gitignore: add ignore file
transport/*: (1/3) add separate layer for transport

Now, we have a transport layer for generic
communication interfaces. Up to now, Ethernet
and Serial RS232 are implemented
fcs_client/*: (2/3) use new transport layer in main program

Now, we can select between Ethernet and serial RS232
for communicating with the FPGA and the RFFE controller
Makefile: (3/3) update Makefile for compiling new transport layer