* 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

Bug 1433400 (CVE-2018-5123) Prevent cross-site image requests from leaking contents of certain fields due to regex search
r=jfearn,a=dylan

r/a=dkl

r/a=glob

r=glob,a=glob

r=dkl a=sgreen

Bug 1032323: canonicalise_query() should omit parameters with empty values so generated URLs are shorter
r=glob,a=sgreen

r=dkl a=justdave

r=dkl a=sgreen

r=dkl a=justdave

r/a=glob

r=glob,a=justdave

r/a=LpSolit

r/a=LpSolit

r=wicked a=LpSolit

r=glob a=LpSolit

r=dkl, a=LpSolit

r=dkl a=LpSolit

r=dkl a=LpSolit

r/a=LpSolit

r=dkl a=LpSolit

Bug 761199: buglist.cgi enters in an infinite loop if called without arguments and the user is logged in
r=timello a=LpSolit

r=glob a=LpSolit

r/a=LpSolit

r=glob 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/a=LpSolit

[r=mkanat a=LpSolit]

"Custom Search" UI.
r=timello, a=mkanat

Bug 655847: Accessing buglist.cgi throws: Use of inherited AUTOLOAD for non-method Bugzilla::CGI::SERVER_PUSH() is deprecated at Bugzilla/CGI.pm line 233
r/a=mkanat

r/a=mkanat

which prevents CGI.pm from generating URLs with semicolons in them instead
of ampersands.
r=glob, a=mkanat