Fix enum compiler warnings (clang -Wenum-conversion)
Remove spurious rotbuf_log() declaration, fixes #75
Create skeleton MSP tech document
Only report that a payload exists if it actually exists
Remove spurius include of netinet/if_ether.h, fixes #76
Clean up "serval.h" a bit

Move some defs to more appropriate header file
Remove unused function prototypes
Remove unused SLIP and CRC32 code
Add missing copyright messages
Fix android build, related to issue #76 fix
Remove bitrot related to voip testing
Finish removing SLIP code and test case

More simplification of "serval.h"
Refactor keyring open/seed out of server()

Now the keyring is opened and seeded before the server daemon process is
forked, and any keyring error prevents the server from starting

No longer necessary to pass a (cli_parsed*) argument to server()
Improve VOMP testing
Enhance console command to allow multiple concurrent calls