Re-add renderable to connected users and fix mouse look

[adam4813]

Description

Update user entity to attach renderable for client side use only

Remove unused appveyor config

Fix mouse look

Motivation and Context

How Has This Been Tested?

Running multiple instances of the client when connecting to the same server shows updated movement. Initial state isn't updated to reflect the current server's state, so still work needed for the physics state sync.

Screenshots (if appropriate):

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have added tests to cover my changes.
• All new and existing tests passed.

[codecov]

Codecov Report

Attention: Patch coverage is 50.00000% with 4 lines in your changes missing coverage. Please review.

Please upload report for BASE (main@c0fe066). Learn more about missing BASE report.

Files with missing lines	Patch %	Lines
client/client-game-state-queue.cpp	0.00%	2 Missing ⚠️
common/controllers/fps-controller.cpp	0.00%	1 Missing ⚠️
server/client-connection.cpp	0.00%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #255   +/-   ##
=======================================
  Coverage        ?   11.12%           
=======================================
  Files           ?      111           
  Lines           ?    13399           
  Branches        ?        0           
=======================================
  Hits            ?     1490           
  Misses          ?    11909           
  Partials        ?        0           

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.