Removes unnecessary client subdirectories and updates buildsystem.
Renames some files:birdc/client.c -> birdc.cbirdcl/client.c -> birdcl.cclient_common.c -> common.c
Add lightweight client - birdcl
Restructure client/ subdir. Add two different flavors of client.The full featured birdc client code is in client/birdc/.The new light client birtcl is in client/birdcl/.Common sources of both clients are directly in client/....
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