Add new lua funcs - tf_setvar(), tf_unsetvar(), tf_sendstr(), tf_sendvar() #85
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* 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.