Improve text width calculation precision (#1408)

In some extreme cases (~30000 chars) text width precision takes a hit.
Using double instead of float fixes that.

src/rencache.c

@@ -191,9 +191,9 @@ void rencache_draw_rect(RenRect rect, RenColor color) {
   }
 }
 
-float rencache_draw_text(RenWindow *window_renderer, RenFont **fonts, const char *text, size_t len, float x, int y, RenColor color)
+double rencache_draw_text(RenWindow *window_renderer, RenFont **fonts, const char *text, size_t len, double x, int y, RenColor color)
 {
-  float width = ren_font_group_get_width(window_renderer, fonts, text, len);
+  double width = ren_font_group_get_width(window_renderer, fonts, text, len);
   RenRect rect = { x, y, (int)width, ren_font_group_get_height(fonts) };
   if (rects_overlap(last_clip_rect, rect)) {
     int sz = len + 1;