This changes the Schema classes enough so they use Moo, which will allow adding a weak reference to the database connection

* use base to make merging with bmo easier

* Revert "Bug 1497042 - Enclose table names in CREATE queries"

This reverts commit 62d5637a.

* refactor Bugzilla::DB to not subclass DBI

* use DBIx::Connector to manage database connections

* Ensure we always call DBIx::Connector->dbh before any DBI method

The code didn't allow a way of doing this without a lot of work.

So I had to take the following approach:
The 'dbh' attribute is now a method that delegates to DBIx::Connector's dbh
method. Per the docs, ->dbh() "Returns the connection's database handle. It will
use a an existing handle if there is one, if the process has not been forked or
a new thread spawned, and if the database is pingable. Otherwise, it will
instantiate, cache, and return a new handle."

Then there is the matter of the 'handles' on dbh. I've used Package::Stash to
insert proxy methods into the class when it is loaded.

* Bug 1328659 - Add support for utf8=utf8mb4 (switches to dynamic/compressed row format, and changes charset to utf8mb4)

* add deps

* add prepare_cached to the list of delegated methods.

This was added in bug 340160

* improve the migration to compressed/dynamic rows, skip views

* add missing semicolon

* remove pre-utf8mb4 emoji support

* fix small issue

* add debugging fatal error

blame jeff

r=dkl a=sgreen

Bug 919475: [Oracle] Crash when non-mandatory free text custom fields are left empty on bug creation
r=LpSolit a=justdave

r/a=LpSolit

r/a=LpSolit

r=wicked a=LpSolit

r=dkl a=LpSolit

r=mkanat a=LpSolit

Bug 680131: Replace the MPL 1.1 license by the MPL 2.0 one in all files, and add it to files which miss one
r=kiko r=mkanat r=mrbball a=LpSolit

r=wicked a=LpSolit

applied to DB::Schema::Oracle, since it has a full override of
get_alter_column_ddl.

https://bugzilla.mozilla.org/show_bug.cgi?id=573441

and PostgreSQL, by adding them all in one ALTER statement
r=mkanat, a=mkanat (module owner)

left-behind PRODUCTS_MILESTONEURL trigger that currently exists in 3.6/trunk.
r=mkanat, a=mkanat

Bug 519584: Implement a framework for migrating from other bug-trackers, and start with a GNATS importer.
Patch by Max Kanat-Alexander <mkanat@bugzilla.org> (module owner) a=mkanat

Bug 500350: [Oracle] Use of uninitialized value in pattern match (m//) at Bugzilla/DB/Schema/Oracle.pm line 149 - Patch by Xiaoou <xiaoou.wu@oracle.com> r/a=mkanat

Bug 486239: [Oracle] Missing keyword RESTRICT on fk creation (DB::Schema explicitly specified DELETE => 'RESTRICT')
Patch by Xiaoou Wu <xiaoou.wu@oracle.com> and Max Kanat-Alexander <mkanat@bugzilla.org> r=mkanat

Bug 472013: [Oracle] checksetup.pl fails with ORA-04091 and you can't change the properties of custom fields - Patch by Xiaoou <xiaoou.wu@oracle.com> r/a=mkanat

Patch By Max Kanat-Alexander <mkanat@bugzilla.org> r=ghendricks

Patch By Xiaoou Wu <xiaoou.wu@oracle.com> r=mkanat, a=mkanat

Patch By Xiaoou Wu <xiaoou.wu@oracle.com> r=mkanat, a=mkanat

Patch By Max Kanat-Alexander <mkanat@bugzilla.org> (module owner) a=mkanat

Patch By Xiaoou Wu <xiaoou.wu@oracle.com> r=mkanat, a=mkanat

Patch By Max Kanat-Alexander <mkanat@bugzilla.org> (module owner) a=mkanat

Bug 310718: [Oracle] Bugzilla::DB::Schema::Oracle module
Patch By Xiaoou Wu <xiaoou.wu@oracle.com> r=mkanat, a=mkanat