add 3 migrations, 1 each for prims, primshapes, and primitems

to move all their UUID stores from varchar(255) -> char(36).  Based
on past evidence, this should help with performance.

OpenSim/Data/MySQL/Resources/008_RegionStore.sql

@@ -0,0 +1,9 @@
+BEGIN;
+
+ALTER TABLE primshapes change UUID UUIDold varchar(255);
+ALTER TABLE primshapes add UUID char(36);
+UPDATE primshapes set UUID = UUIDold;
+ALTER TABLE primshapes drop UUIDold;
+ALTER TABLE primshapes add constraint primary key(UUID);
+
+COMMIT;