Refactor MonorubyErr and Exception class.

[sisshiki1969]

• Refactor MonorubyErr and Exception class.
• Support String#delete, String#ascii_only?, String.try_convert, Array#to_h.

[codecov]

Codecov Report

Attention: Patch coverage is 39.06936% with 694 lines in your changes missing coverage. Please review.

Project coverage is 72.07%. Comparing base (21185a9) to head (85a4cfb).
Report is 12 commits behind head on master.

Files with missing lines	Patch %	Lines
monoruby/src/builtins/string.rs	5.86%	273 Missing ⚠️
monoruby/src/builtins/kernel.rs	32.23%	103 Missing ⚠️
monoruby/src/globals/error.rs	45.00%	77 Missing ⚠️
monoruby/src/value.rs	38.46%	40 Missing ⚠️
monoruby/src/globals/store/class.rs	31.57%	26 Missing ⚠️
monoruby/src/builtins/module.rs	18.51%	22 Missing ⚠️
monoruby/src/value/rvalue.rs	41.66%	21 Missing ⚠️
monoruby/src/builtins/time.rs	0.00%	18 Missing ⚠️
monoruby/src/builtins/regexp.rs	21.05%	15 Missing ⚠️
monoruby/src/builtins/array.rs	87.87%	12 Missing ⚠️
... and 24 more

Additional details and impacted files

@@             Coverage Diff             @@
##           master      #72       +/-   ##
===========================================
- Coverage   87.11%   72.07%   -15.05%     
===========================================
  Files         135      135               
  Lines       42113    42468      +355     
===========================================
- Hits        36686    30608     -6078     
- Misses       5427    11860     +6433     

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