[non-BE][rend-non-BE][split-non-BE][allow-regression] Resolve more MASA 2TC rendering to MONO/FOA/HOA MLD differences

• Related issues: At least #2442 (closed) but may hit others
• Requested reviewers: @vasilache

Reason why this change is needed

• There are numerous high MLD cases still with OMASA/MASA to MONO/FOA/HOA rendering and these seem to be caused by numeric issues in BASOP.

Description of the change

• Fix renderer side azimuth and elevation truncation on copy to DirAC renderer (wrong direction for negative angles)
• Improve power computation accuracy in multiple places
• Add a lower gain limit (6 dB instead of 30 dB) for diffuse gains applied to decorrelated power when the prototype power is very low.

Affected operating points

• Renderer and decoder non-BE
• Main effect is in MASA/OMASA to MONO/FOA/HOA but due to processing paths involved, this could also affect SBA and McMASA.
• Renderer has MASA -> anything else diff because azimuth and elevation copying is fixed to align with float

Closes #2442 (closed)