Fix the MuSig module after integrating bip-schnorr updates

1.  using xonly_pubkeys in MuSig for input public keys and the combined
    pk. For that to work we need to store whether the MuSig aggregated point
    has an even y in the session, may need to negate each signers secret
    key and may need to negate each signers public key in
    musig_partial_sig_verify.
2.  using a tagged hash for the message hash.
3.  use !fe_is_odd in place of fe_is_quad_var

src/secp256k1.c

@@ -768,14 +768,22 @@ int secp256k1_ec_pubkey_combine(const secp256k1_context* ctx, secp256k1_pubkey *
 # include "modules/ecdh/main_impl.h"
 #endif
 
-#ifdef ENABLE_MODULE_MUSIG
-# include "modules/musig/main_impl.h"
-#endif
-
 #ifdef ENABLE_MODULE_RECOVERY
 # include "modules/recovery/main_impl.h"
 #endif
 
+#ifdef ENABLE_MODULE_EXTRAKEYS
+# include "modules/extrakeys/main_impl.h"
+#endif
+
+#ifdef ENABLE_MODULE_SCHNORRSIG
+# include "modules/schnorrsig/main_impl.h"
+#endif
+
+#ifdef ENABLE_MODULE_MUSIG
+# include "modules/musig/main_impl.h"
+#endif
+
 #ifdef ENABLE_MODULE_GENERATOR
 # include "modules/generator/main_impl.h"
 #endif
@@ -792,10 +800,3 @@ int secp256k1_ec_pubkey_combine(const secp256k1_context* ctx, secp256k1_pubkey *
 # include "modules/surjection/main_impl.h"
 #endif
 
-#ifdef ENABLE_MODULE_EXTRAKEYS
-# include "modules/extrakeys/main_impl.h"
-#endif
-
-#ifdef ENABLE_MODULE_SCHNORRSIG
-# include "modules/schnorrsig/main_impl.h"
-#endif