Refactor encrypting/decrypting streams for easier adoption of new encryption stream types.

[ni4]

It was too hardcoded CFB (Raw/MDC) vs AEAD. These changes should allow easier adoption of new modes.

[codecov]

Codecov Report

Patch coverage: 78.26% and project coverage change: -0.03 ⚠️

Comparison is base (e4c9bea) 83.36% compared to head (62d5dad) 83.34%.

❗ Current head 62d5dad differs from pull request most recent head 1bee07b. Consider uploading reports for the commit 1bee07b to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2014      +/-   ##
==========================================
- Coverage   83.36%   83.34%   -0.03%     
==========================================
  Files         159      159              
  Lines       31897    31903       +6     
==========================================
- Hits        26590    26588       -2     
- Misses       5307     5315       +8     

Impacted Files	Coverage Δ
src/librepgp/stream-parse.cpp	77.25% <67.74%> (-0.44%)	⬇️
src/librepgp/stream-write.cpp	77.55% <100.00%> (+0.02%)	⬆️

... and 1 file with indirect coverage changes

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