glob_commands() would run off the end of the irc_command array if given a match that matched
the last command. It also leaked memory because it used m_s3cat() to construct the string,
then passed that to m_strdup().
This fixes these problems by reworking glob_commands(), and at the same time removes the use
of alloca() and wild_match() by using strncmp() instead to match the start of a string. Move
glob_commands() to alias.c and make it static since it's only used for aliasctl().
Change the 'name' argument of find_command() and find_dll_command() to const char * at the same
time, so that glob_commands()'s prefix argument can be const char * too.
Clean up e_topic(), splitting out untopic() and using prepare_command()
to check for ops.
git-svn-id: svn://svn.code.sf.net/p/bitchx/code/trunk@136 13b04d17-f746-0410-82c6-800466cd88b0
