moved misc helper functions to separate file and removed redundant includes

src/misc_tools.h

@@ -0,0 +1,18 @@
+/*
+ * Toxic -- Tox Curses Client
+ */
+
+/* convert a hex string to binary */
+unsigned char *hex_string_to_bin(char hex_string[]);
+
+/* get the current local time */
+struct tm *get_time(void);
+
+/* check that the string has one non-space character */
+int string_is_empty(char *string);
+
+/* convert wide characters to null terminated string */
+uint8_t *wcs_to_char(wchar_t *string);
+
+/* convert a wide char to null terminated string */
+char *wc_to_char(wchar_t ch);