REORG: include: move base64.h, errors.h and hash.h from common to to haproxy/

These ones do not depend on any other file. One used to include
haproxy/api.h but that was solely for stddef.h.
diff --git a/src/ssl_crtlist.c b/src/ssl_crtlist.c
index 38cffc8..1d77362 100644
--- a/src/ssl_crtlist.c
+++ b/src/ssl_crtlist.c
@@ -15,7 +15,7 @@
 #include <sys/stat.h>
 #include <sys/types.h>
 
-#include <common/errors.h>
+#include <haproxy/errors.h>
 #include <common/standard.h>
 
 #include <dirent.h>