Implement before attribute for EFContainer, EFBlock and their References about programcms

[elquchiri]

(+) Keep the original tree elements priority when rendering page.

[elquchiri]

(+) Change containers[] and blocks[] childs by a new childs[] structure (array) and append elements by identifying theme with a ['type'] = "container|block"

[elquchiri]

Done

[elquchiri]

Have to implement:

• After attribute for EFBlock, EFContainer Tags
• Remove for EFReferenceContainer and EFReferenceBlock

[elquchiri]

After attribute for EFBlock, EFContainer Tags => Done
Remove for EFReferenceContainer and EFReferenceBlock => Replaced with a new EFMove Node