Various fixes to reduce amount of warnings

[Hermanest]

Updated inspections:

• MA0046: The delegate must have 2 parameters
• MA0069: Non-constant static fields should not be visible
• MA0051: Method is too long (reactive methods cannot be made shorter)
• MA0011: Use an overload of 'Parse' that has a 'System.IFormatProvider' parameter (redundant boilerplate)
• MA0099: Use Explicit enum value for '..' instead of num (masks are used frequently so this is not useful)
• MA0055: Do not use finalizer (destructors are useful)
• CS0436: Conflicting namespace members from different assemblies (shown even for internal members, doesn't affect anything but produces a warning)

Besides that I've removed some unused code and tried to reduce the amount of nullable mismatches by manually changing annotations.