put string helpers in own file

src/misc_tools.h

@@ -43,35 +43,3 @@ int qsort_strcasecmp_hlpr(const void *nick1, const void *nick2);
       - cannot start with a space
       - must not contain contiguous spaces */
 bool valid_nick(uint8_t *nick);
-
-/*
- * Buffer helper tools.
- */
-
-/* Adds char to buffer at pos */
-void add_char_to_buf(wchar_t *buf, size_t *pos, size_t *len, wint_t ch);
-
-/* Deletes the character before pos */
-void del_char_buf_bck(wchar_t *buf, size_t *pos, size_t *len);
-
-/* Deletes the character at pos */
-void del_char_buf_frnt(wchar_t *buf, size_t *pos, size_t *len);
-
-/* Deletes the line from beginning to pos */
-void discard_buf(wchar_t *buf, size_t *pos, size_t *len);
-
-/* Deletes the line from pos to len */
-void kill_buf(wchar_t *buf, size_t *pos, size_t *len);
-
-/* nulls buf and sets pos and len to 0 */
-void reset_buf(wchar_t *buf, size_t *pos, size_t *len);
-
-/* looks for the first instance in list that begins with the last entered word in buf according to pos, 
-   then fills buf with the complete word. e.g. "Hello jo" would complete the buffer 
-   with "Hello john".
-
-   list is a pointer to the list of strings being compared, n_items is the number of items
-   in the list, and size is the size of each item in the list. 
-
-   Returns the difference between the old len and new len of buf on success, -1 if error */
-int complete_line(wchar_t *buf, size_t *pos, size_t *len, const void *list, int n_items, int size);