[*] MO : blocktags : configure BLOCKTAGS_MAX_LEVEL

* Add input for BLOCKTAGS_MAX_LEVEL to be customised (replace an hardcoded define)
* rewrite getContent() values check (it was overloading checks over and over)
// follow up https://github.com/PrestaShop/blocktags/pull/2/files
Merge branch 'ZiZuu-store-patch-1' into dev