Revert "Move BinPAC, bifcl, af_packet, and gen_zam submodules into main zeek repo"

tools/binpac/TODO

@@ -1,34 +0,0 @@
-Big features
-* Variable context (xid, call in RPC)? -- no variable context
-* Helpers
-* Connection states and actions
-* Case and analyzer redef
-* &also withinput
-* Explicit analyzer context (interface + instantiation) "withcontext"
-+ Interface with C++ and Zeek (events, extern, weird)
-+ Incremental input
-+ ASCII protocols
-+ Reassembly
-- Dealing with exceptions
-- Dependency analysis to save parsing time on unused fields
-- Performance measurement
-
-Small features
-* Restructure the code: break up pac.{h,cc}
-* ref counting (to keep certain structures)
-* analyzer context as a parameter of class
-* &autolength
-* find a better name for "analyzer_context" ("analcxt", "context", "analyzer") $context
-* &if
-* &autolength (now &restofdata)
-* Use vector<> instead of array<>?
-* set end_of_data when &length = ...
-- make the `default' case mandatory?
-- &inline
-- &warn and &check? (follow &if)
-- typedef?
-
-Binpac 1
-- create a namespace for each .pac file
-- type equivalence
-- byteorder() for every type?