Warnings in GCC and VC

[Thrameos]

This PR deals with warnings that are currently triggering in VC and GCC.

• Local variables not used on exception catches
• Mismatched types between primitives requiring casts
• A throw path on extern "C" that must not be allowed to propagate or it will trigger a segfault.

[codecov]

Codecov Report

Attention: 3 lines in your changes are missing coverage. Please review.

Comparison is base (4471a27) 87.49% compared to head (9d5d399) 87.44%.

Files	Patch %	Lines
native/common/jp_proxy.cpp	0.00%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1161      +/-   ##
==========================================
- Coverage   87.49%   87.44%   -0.05%     
==========================================
  Files         113      113              
  Lines       10233    10236       +3     
  Branches     4057     4057              
==========================================
- Hits         8953     8951       -2     
- Misses        688      692       +4     
- Partials      592      593       +1     

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