Fix types and PHP version-related issues

[reimic]

What does this PR do?

• Fixes an error where the Resource Resolver... Resolving process was erroneously typed and caused PHP to confuse itself.
• Fixes types to match PHP 7.0 coding standards.
• Fixed some other small issues in affected classes that would cause coding standards to signal warnings.
• Fixed a member access issue caused by the Compiler.

[reimic]

Current state:

PS D:\blueprints> php blueprint_compiling.php
 [===>------------------------]  13/100 -- Extracting WordPressPHP Warning:  rename(D:\blueprints\new-wp\tmp\tmpCAB2.tmp/wordpress/wp-admin,D:/blueprints/new-wp/wp-admin): Access is denied (code: 5) in D:\blueprints\src\WordPress\
Blueprints\functions.php on line 52
PHP Fatal error:  Uncaught Symfony\Component\Filesystem\Exception\IOException: Failed to move the file from D:\blueprints\new-wp\tmp\tmpCAB2.tmp/wordpress/wp-admin at D:/blueprints/new-wp/wp-admin in D:\blueprints\src\WordPress\Bl
ueprints\functions.php:54

This starts to look like a #60 issue.

[adamziel]

@reimic let's clean up this PR and handle the new issue separately

[reimic]

@adamziel Ok. In what state would you like the PR?

I've changed the core PHP rename to Symfony's version which handles Windows cases better. This allowed me to realize, that before each new run of any blueprint I have to manually clear the generated new-wp file. (This is a callback to our discussion on rollbacks.) But still, after handling that, the current error is:

PS D:\blueprints> php blueprint_compiling.php
 [=======>--------------------]  26/100 -- Installing SQLite integration pluginPHP Fatal error:  Uncaught WordPress\Blueprints\Runtime\ProcessFailedException: Process `php wp-cli.phar core install "--url=http://localhost:8081" "--
title=Playground Site" --admin_user= --admin_password=admin [email protected]` failed with exit code 1 and the following stderr output:
Error: PDO Driver for SQLite is missing. Your PHP installation appears not to have the right PDO drivers loaded. These are required for this version of WordPress and the type of database you have specified.

[adamziel]

Let's scope this PR to one specific error it solves, not "getting the entire workflow to run". The smaller the changes, the easier to review and discuss they are.