- implement chain-reuse for output

- remove macros hell from ngx_rtmp_send.c

- packet dropping

- l <-> cl

- closing session on send error
  causes crash because of double-freeing stack

- add max message size

- recognize amf-meta

- shortcuts for big-endian copy

- implement loc confs (=fms apps)
    loc options:
    - broadcast/file
    - HTTP callbacks on invoke calls