#38 Return null to abort IPreHandler/IPostHandler chain
#39 Allow to specify initial data element for create method of ListNode
and BiListNode
#40 Packages imported dynamically should also be imported statically
with an optional flag for org.jruyi.cmd module

#41 Implementation of "route:*" commands should be moved to org.jruyi.me
module
#42 Improve script ruyi and ruyi-cli
#43 Implement varint codec for buffer
#44 Reformat copyright
#45 Initialize the capacity of StringBuilder in BytesBuilder.append(String)
#46 Add IUnitChain.remaining for codec to know the number of bytes remaining in the chain