Rhubarb Lip Sync 2 MVP

[DanielSWolf]

This issue tracks the steps toward an MVP version of Rhubarb 2. The goal is to have a first working version based on the new architecture, but without any non-essential features (automatic speech recognition, phonetic recognition, third-party integrations, full documentation, GUI, etc.).

• Working CI build (Rust) for all platforms
• Audio library (loading WAVE and Ogg Vorbis files, trimming, resampling, caching)
• Generic timeline data structure
• Forced alignment using custom Rust port of Montreal Forced Aligner
• Minimal debugging GUI
• Rust port of existing animation algorithm
• Minimal set of exporters
• Minimal CLI