fcft: adapt to API changes in fcft-3.x

Fcft no longer uses wchar_t, but plain uint32_t to represent
codepoints.

Since we do a fair amount of string operations in foot, it still makes
sense to use something that actually _is_ a string (or character),
rather than an array of uint32_t.

For this reason, we switch out all wchar_t usage in foot to
char32_t. We also verify, at compile-time, that char32_t used
UTF-32 (which is what fcft expects).

Unfortunately, there are no string functions for char32_t. To avoid
having to re-implement all wcs*() functions, we add a small wrapper
layer of c32*() functions.

These wrapper functions take char32_t arguments, but then simply call
the corresponding wcs*() function.

For this to work, wcs*() must _also_ be UTF-32 compatible. We can
check for the presence of the  __STDC_ISO_10646__ macro. If set,
wchar_t is at least 4 bytes and its internal representation is UTF-32.

FreeBSD does *not* define this macro, because its internal wchar_t
representation depends on the current locale. It _does_ use UTF-32
_if_ the current locale is UTF-8.

Since foot enforces UTF-8, we simply need to check if __FreeBSD__ is
defined.

Other fcft API changes:

* fcft_glyph_rasterize() -> fcft_codepoint_rasterize()
* font.space_advance has been removed
* ‘tags’ have been removed from fcft_grapheme_rasterize()
* ‘fcft_log_init()’ removed
* ‘fcft_init()’ and ‘fcft_fini()’ must be explicitly called

config.h

@@ -2,6 +2,7 @@
 
 #include <stdint.h>
 #include <stdbool.h>
+#include <uchar.h>
 
 #include <tllist.h>
 
@@ -80,7 +81,7 @@ struct config {
     char *shell;
     char *title;
     char *app_id;
-    wchar_t *word_delimiters;
+    char32_t *word_delimiters;
     bool login_shell;
     bool locked_title;
 
@@ -142,21 +143,21 @@ struct config {
                 SCROLLBACK_INDICATOR_FORMAT_TEXT,
             } format;
 
-            wchar_t *text;
+            char32_t *text;
         } indicator;
         float multiplier;
     } scrollback;
 
     struct {
-        wchar_t *label_letters;
+        char32_t *label_letters;
         struct config_spawn_template launch;
         enum {
             OSC8_UNDERLINE_URL_MODE,
             OSC8_UNDERLINE_ALWAYS,
         } osc8_underline;
 
-        wchar_t **protocols;
-        wchar_t *uri_characters;
+        char32_t **protocols;
+        char32_t *uri_characters;
         size_t prot_count;
         size_t max_prot_len;
     } url;