fix(clcore): Adjust "==" and "!=" operators to fix null reference exceptions

[Keyinator]

Goal of this PR

Fix potential null reference exceptions in clcore.

How is this PR achieving the goal

Instead of using left.Equals(right) where left could be null, leading to a null reference exception, we check both left and right for being null before.

This PR applies to the following area(s)

FiveM, RedM, Client, ScRT: C#

Successfully tested on

Checklist

• Code compiles and has been tested successfully.
• Code explains itself well and/or is documented.
• My commit message explains what the changes do and what they are for.
• No extra compilation warnings are added by these changes.

Fixes issues

fixes #1312

[Keyinator]

The errors from the action don't seem to be caused by my code if I am not mistaken

[DaniGP17]

Yeah, for me is compiling well

[jakub-cfx]

Compiled just fine locally, tested by joining a game on b2802 and fiddling around with a couple of C# resources, everything worked as expected.