[TASK] fix parameter case 'TRUE' > 'true'
[FEATURE] Added typoscript parameter speciality.debug_css

speciality.debug_css: if set to 1 the CSS files loaded by EXT:speciality/Resources/Private/Partials/SharedResources.html won't be merged and won't be the minified version.
This is useful while debug/inspect CSS of the website.

Fixes: #71