Crashfix jump server name and pass len handling

[michaelortmann]

Found by: michaelortmann
Patch by: michaelortmann
Fixes:

One-line summary:

Additional description (if needed):
Due to eggdrops mod API, we cannot use sizeof in irc.mod for strings defined in server.mod. I guess this is the reason those strcpy()s were not converted to strlcpy()s before.

Test cases demonstrating functionality (if applicable):
/msg BotA jump hunter2 aaaaaaaaaabbbbbbbbbbaaaaaaaaaabbbbbbbbbbaaaaaaaaaabbbbbbbbbbaaaaaaaaaabbbbbbbbbbaaaaaaaaaabbbbbbbbbbaaaaaaaaaaabbbbbbbbbba.edu

[08:27:50] [@] :testuser!~michael@localhost PRIVMSG BotA :jump hunter2 aaaaaaaaaabbbbbbbbbbaaaaaaaaaabbbbbbbbbbaaaaaaaaaabbbbbbbbbbaaaaaaaaaabbbbbbbbbbaaaaaaaaaabbbbbbbbbbaaaaaaaaaaabbbbbbbbbba.edu
[08:27:50] pbkdf2 method SHA256 rounds 16000, user 10.718ms sys 6.447ms
[08:27:50] (testuser!~michael@localhost) !testuser! JUMP aaaaaaaaaabbbbbbbbbbaaaaaaaaaabbbbbbbbbbaaaaaaaaaabbbbbbbbbbaaaaaaaaaabbbbbbbbbbaaaaaaaaaabbbbbbbbbbaaaaaaaaaaabbbbbbbbbba.edu 6667 
=================================================================
==28916==ERROR: AddressSanitizer: global-buffer-overflow on address 0x78eb664f6b79 at pc 0x78eb69ef6a02 bp 0x7ffdedec78b0 sp 0x7ffdedec7058
WRITE of size 127 at 0x78eb664f6b79 thread T0
    #0 0x78eb69ef6a01 in strcpy /usr/src/debug/gcc/gcc/libsanitizer/asan/asan_interceptors.cpp:563
    #1 0x78eb64d84943 in msg_jump .././irc.mod/msgcmds.c:1098
[...]