V1.14.0 Remove custom logger to support Drupal>7

Re:

• Issue: #138 (closed)
• Replaces MR: !126 (closed)
• Replaces MR: !127 (closed)
• Replaces MR: !124 (closed)

Hello Drupal 8+ users, would any of you mind testing this branch? @pradeep @seamuslee @sluc23 @ufundo

Changes:

• only require_once the vendor libs if they exist in the extension's dir. So you can have the libs in a central place somewhere else.
• Add status check for class_exists(\GoCardlessPro\...) so it's clear when an install is broken.
• Remove custom logger; fixing signature incompatibilities.
• phpunit test environment only: dependency on taggedlog extension. I have addressed the signature problems therein (see how).

mentioned in issue #138 (closed)

mentioned in merge request !126 (closed)

mentioned in merge request !127 (closed)

mentioned in merge request !124 (closed)

added 1 commit

• 12bb9943 - Upgrade civix; bump version in info to 1.14.0

Compare with previous version

changed the description

added 2 commits

• de701d31 - Fix test bootstrap for running under Drupal10
• f3860472 - Update README

Compare with previous version

resolved all threads

Thanks @ufundo for testing this PR

I'll probably release this in a week or so, to give anyone else chance to test it.

Closing in favour of !130 (closed) (which includes the changes here too).

closed