Choreography-driven sentence system

[Blixibon]

An experimental alternative to sentences.txt which arranges sounds into VCD files at runtime and can be loaded by map-specific files. Unlike sentences.txt, this system's virtual words are fully configurable, and it can theoretically be used to put together any configuration of sound files/soundscripts on the fly. This can, for example, be used to create custom sentences for NPCs such as Combine soldiers without grappling with the limitations of sentences.txt.

A few examples can be found in this archive: choreosentences_examples.zip

Since this isn't an inherently necessary default feature, and sentences.txt works well enough for the default sentences, no actual new choreo sentences are planned come with Mapbase by default.

At the moment, choreo sentences can only be triggered through a new choreosentence response type in talker files or via the new choreosentence_play command.

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PR Checklist

• My PR follows all guidelines in the CONTRIBUTING.md file
• My PR targets a develop branch OR targets another branch with a specific goal in mind

[Blixibon]

Putting this in draft status until Linux compile is fixed