Fast PCM Encoding

[FalconPDX]

Uses the pcm library to encode a range instead of each element in a range. Makes encoding much faster.

This is a first of three different packages - starting off with the smallest. The other two (refactor of the ofstream interface + FLAC encoding) will come at a later time in the form of a "stacked PR". This gives users a chance to try out the individual pieces and potentially find issues quicker at the cost of repeated testing.

The other two PRs:
ofstream refactor: FalconPDX#3
FLAC encoding: FalconPDX#4

[codecov]

Codecov Report

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

Comparison is base (89eb1e3) 83.10% compared to head (f10b034) 83.00%.

Files	Patch %	Lines
audiostream/inc/ni/media/audio/ostream.h	83.33%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #72      +/-   ##
==========================================
- Coverage   83.10%   83.00%   -0.10%     
==========================================
  Files          82       82              
  Lines        2024     2030       +6     
==========================================
+ Hits         1682     1685       +3     
- Misses        342      345       +3     

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