feat: Bridge classes removal, Namespace cleanup [MTT-4014]

[pdeschain]

Description

NetworkCharacterState and CharacterClassContainer have been removed and merged into ServerCharacter. All the API usage has been adjusted accordingly. In multiple places we're now using ServerCharacter.ClientCharacterVisualization instead of using (now removed) ClientCharacter class (that used to serve as a bridge to ClientCharacterVisualization).

Door and Floor switch's client and server code has also been merged.

Namespaces have been adjusted to match asmdefs.

Many variables and events were renamed (fixing capitalization or due to type changes etc).

Issue Number(s)

MTT-4014

Contribution checklist

• [ ] Tests have been added for boss room and/or utilities pack
• [ ] Release notes have been added to the project changelog file and/or package changelog file
• [x] Pull request has a meaningful description of its purpose
• [x] All commits are accompanied by meaningful commit messages
• [x] JIRA ticket ID is in the PR title or at least one commit message
• [x] Include the ticket ID number within the body message of the PR to create a hyperlink