Modified stok buffer to be dynamically resized

[gtnoble]

Tokenizing long lexemes would cause eisl to crash due to overflowing the stok.buf buffer. I modified stok to have a dynamically resized buffer which can accommodate arbitrarily sized lexemes.

This change caused the compiler to crash due to bugs in f_unwind_protect and has_danger_p. The original code would recursively check the car of forms, but a form with a cons as the car can't be evaluated. I modified it so that it only checks if the car of the evaluated forms matches the forbidden symbols.

[sasagawa888]

Thank you.

[gtnoble]

a form with a cons as the car can't be evaluated.

This is not true, but seems to be an uncommon case:

>>((car (list #'print )) "hello")
"hello"
NIL

I intend to revisit this to be more comprehensive.

[sasagawa888]

Thank you.