Don't use the eosio.token account for txn_test_gen_plugin usage; this frequently clashes will a real network. Create another account where we upload eosio.token for txn_test_gen_plugin usage

Also added a version and extensions field to abi_def.

move the deferred limit to the producer plugin which now controls it; route all new blocks through producer so it can maintain invariant that there is always a pending block (whether for speculative execution or future signing); re-apply unapplied transactions and apply deferred transactions on a new block (NOTE: this needs proper throttling once subjective failures are handled correctly inside controller).  Remove spurious calls to start_block in other plugins

Add a configuration for the "lag" off of the head block for the reference block for generated transactions.  This allows us to test Tapos to HEAD and tapos to LIB as well as many other options

Do it by the book -- this is an action on the system contract complete with an ABI

Looks like txn_test_gen_plugin wasn't set expiration for a couple of its transactions. Previously that didn't matter, now it does. Also I had problems with stopping the transaction generation so fix that too.

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Previously txn_test_gen_plugin used the native EOS token. Change it to use the wasm currency contract. This allows banging on the more frequent wasm execution path.

main.cpp gets shorter, CMakeLists.txt gets longer, door opens for
conditional compilation of plugins.

removed scope from transaction
renamed scope on action to account
added scopes to shard
fixed up scheduling and tests
fixed up eosioc

main.cpp gets shorter, CMakeLists.txt gets longer, door opens for
conditional compilation of plugins.

This reverts commit 13f7e147.

(cherry picked from commit 55d24e6e)