[Yanel-dev] Cleaned src code

[Alec Bickerton]

Hi,

I've ran a few code cleanup tools on the yanel code base and removed all
 the areas that were identified as potential problems.

The settings were very conservative, targeting only the following.
- Unused imports
- Unused variables (local and private)
- Redundant null checks
- Redundant if-else nesting
- Indirect access to static fields.

Can someone with commit access take a look.

Alec,
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