Add new lua funcs - tf_setvar(), tf_unsetvar(), tf_sendstr(), tf_sendvar()

[erikarn]

• tf_setvar(name, value) handles setting global variable values
  • tf_unsetvar(name) handles clearing a global variable
  • tf_sendstr(string, world, flags) is the analog to send() - send the string argument to the given world with flags
  • tf_sendvar(var, world, flags) is the analog to send() - send the /variable/ argument (ie, what's in the TF global variable) to the given world with flags.

The reason for tf_sendvar() is to simplify things involving variables w/ attributes in them that may have been captured via triggers and such.

[ingwarsw]

Thats cool additions.. Thanks a lot..