IBX-538: Aligned codebase with rebranded ibexa/core

[alongosz]

Question	Answer
JIRA issue	IBX-538
Type	bug
Target version	Ibexa 4.0
BC breaks	no
Doc needed	no

There are some cases which BC layer (ibexa/namespace-compatibility) does not handle yet, so for now performed partial cross-rebranding for already discovered issues.

Changelist

• [Composer] Required rebranded ibexa/core
• [Composer][DX] Moved current namespace prefixes to the top of autoloader
• Aligned Value Object Visitor DIC with core changes
• Aligned Input Parsers DIC with core changes
• Aligned DIC services with core changes

[alongosz]

Postponed to be able to fix BC layer.

[alongosz]

Closing in favor of #7