Remove all mentions of Explicit Resource Management features

[rijenkii]

Fixes #260.
Fixes #267.

Replaces

using _guard = this.enteringGuard(); // Function body

in Encoder and Decoder classes with

try { this.entered = true; // Function body } finally { this.entered = false; }

Diff is ugly, but no other changes have been made.
Recommend disabling whitespace changes when reviewing, then only actual code changes are visible.

All tests pass.

[rijenkii]

Alternative, perhaps better solution if using shiny new things is a must (completely understand, I am the same), see #270.

[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 97.14286% with 2 lines in your changes missing coverage. Please review.

Project coverage is 97.36%. Comparing base (59057ee) to head (69295b3).
Report is 5 commits behind head on main.

Files with missing lines	Patch %	Lines
src/Decoder.ts	96.55%	2 Missing ⚠️

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Additional details and impacted files

@@ Coverage Diff @@ ## main #268 +/- ## ========================================== + Coverage 97.28% 97.36% +0.08%  ========================================== Files 17 16 -1 Lines 1140 1138 -2 Branches 253 252 -1 ========================================== - Hits 1109 1108 -1  + Misses 31 30 -1 

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[gfx]

Thanks for your contribution. Looks good to me. Will release a new version soon.

[gfx]

close #270