[Scoped] Add more paths to downgrade, tweak scope configs

[samsonasik]

reduce syntax errors from : 383 to 14:

Before:

Syntax error found in 383 files

After:

Syntax error found in 14 files

[TomasVotruba]

This must be handled by Rector. If not, there is a bug somewhere

[samsonasik]

this for handilng phpstan's vendor of ondrejmirtes/better-reflection/src that somehow not downgrade the code.

[TomasVotruba]

All packages must be downgraded by Rector. scoper.php is only for tweaking class names for autoload edge cases.

We need to figure out why this downgrade is missed. Maybe its in exlcuded paths in downgrade config for Rector?

[samsonasik]

Some probably caused by exclude config :

rector/build/config/config-downgrade-php70.php

Lines 51 to 63 in 6ddb145

	'vendor/symfony/http-kernel/HttpKernelBrowser.php',
	'vendor/symfony/http-foundation/Session/*',
	'vendor/symfony/string/Slugger/AsciiSlugger.php',
	'vendor/symfony/cache/*',
	'nette/caching/src/Bridges/*',
	// This class has an issue for PHP 7.1:
	// https://github.com/rectorphp/rector/issues/4816#issuecomment-743209526
	// It doesn't happen often, and Rector doesn't use it, so then
	// we simply skip downgrading this class
	'vendor/symfony/dependency-injection/ExpressionLanguage.php',
	'vendor/symfony/dependency-injection/ExpressionLanguageProvider.php',
	'vendor/symfony/var-dumper/Caster/*',

other probably need re-sort the directories.

I will check more.