Progress: Further work in TacocaT and in particular update kt_tacocat_socket_set_t...

Progress: Further work in TacocaT and in particular update kt_tacocat_socket_set_t structure.

Restructure the kt_tacocat_socket_set_t to reduce the number of arrays.
I originally had the structure for f_polls_t.
I then got lazy and kept using the same array structure for everything.
Fix the array structure of kt_tacocat_socket_set_t and provide kt_tacocat_socket_sets_t.

The buffer string intended for a generic cache is move into the kt_tacocat_cache_t.
I am not sure if this is even being used and so this buffer string cache may be removed in the future if I fail to find a use for it.

Begin setting up the custom file name variable to resolve the fixme.
Also make preparations for only opening the file on poll and read operations.
Then close the file when done.
This keeps files from being held open for no reason.