Feature: Support php7.4 (#1354)

* Run CI tests against php 7.4

* Sort composer dependencies

* Remove unused Aws S3 php library

* Pin simplepie dependency to ^1.5

* Pin getid3 dependency to ^1.9

* Pin composer semver to ^3.2

* Pin php-amqplib to ^2.12

* Drop sentry logging support

* Update composer dependencies

* Move propel regenerate to Makefile

* Regenerate propel files with v1.7.0

* Pin propel orm to ^1.7

* Regenerate propel files with v1.7.2

* fix: generator_version in airtime-conf-production.php

* Replace propel/propel1 with jooola/propel1

* Regenerate propel files with v1.7.3-dev

* Fix php7.4 compatibility

Using php-cs-fixer:

    '@PhpCsFixer' => true,
    'concat_space' => ['spacing' => 'one'],
    'ordered_class_elements' => false,
    'yoda_style' => false,
    '@PHP74Migration' => true,
    'assign_null_coalescing_to_coalesce_equal' => false,
    'ternary_to_null_coalescing' => false,
    'heredoc_indentation' => false,
    '@PHP74Migration:risky' => true,
    'declare_strict_types' => false,
    'void_return' => false,
    'use_arrow_functions' => false,

* Fix pre-commit

legacy/application/services/PodcastEpisodeService.php

@@ -456,7 +456,7 @@ class Application_Service_PodcastEpisodeService extends Application_Service_Thir
                 Logging::info($testenclosures);
                 // we need to check if this is an array otherwise sizeof will fail and stop this whole script
                 if (is_array($testenclosures)) {
-                    $numenclosures = sizeof($testenclosures);
+                    $numenclosures = count($testenclosures);
                     // now we loop through and look for a audio file and then stop the loop at the first one we find
                     for ($i = 0; $i < $numenclosures + 1; ++$i) {
                         $enclosure_attribs = array_values($testenclosures[$i]['attribs'])[0];