Simplify ensureHtaccess(), more portable for composer template between 7.x/8.x

Drupal\Core\Composer\Composer::ensureHtaccess() is now using Drupal\Component\PhpStorage\FileStorage::htaccessLines() for generating .htaccess, during post-autoload-dump phase when running composer.

Ideally when implementing something similar as Composer Template for Drupal Project, we should include the line "post-autoload-dump": "Drupal\\Core\\Composer\\Composer::ensureHtaccess" inside template's composer.json, so the generation of .htaccess will handle automatically, and so refer to the latest changes inside Drupal core, too.

BTW, when developing my DruStack Standard Edition for both Drupal 7.x/8.x, I found that will NOT works for 7.x branch if just simply copy-and-paste the composer.json from 8.x branch, because we DON'T (yes for sure, ever and never) have the class Drupal\Component\PhpStorage\FileStorage inside Drupal 7.x source code!

Anyway, since 99.99% of code inside Drupal\Core\Composer\Composer::ensureHtaccess() are already portable for Drupal 7.x/8.x composer template development unless the call to Drupal\Component\PhpStorage\FileStorage::htaccessLines(), now I coming with a solution that:

• Clone core/lib/Drupal/Core/Composer/Composer.php entirely as my own ScriptHandler.php
• Modify the call to Drupal\Component\PhpStorage\FileStorage::htaccessLines() as hard code style (i.e. as patch attached)
• Now I can synchronize the ScriptHandler.php bewteen both 7.x branch and 8.x branch with no additional modification

Long story short, this proof the call to Drupal\Component\PhpStorage\FileStorage::htaccessLines() is not a must, where transform it as hard code implementation can even give a good reference and starting point for composer template development for Drupal.

Original implementation cloned from (ok these 2 files are just identical):

• https://github.com/drustack/drustack-standard/blob/7.44.x/src/Composer/S...
• https://github.com/drustack/drustack-standard/blob/develop/src/Composer/...

Usage example:

• https://github.com/drustack/drustack-standard/blob/7.44.x/composer.json
• https://github.com/drustack/drustack-standard/blob/develop/composer.json