Bridgetown 1.2 Integration Branch

[jaredcwhite]

• [x] New initialization system with a migration away from various cases of "global" state
• [x] Deprecation of bridgetown_plugins Bundler group
• [x] Plugin normalization across Bridgeotwn and Roda
• [x] Roda configs streamlined, Routes plugin refactored and test suite added
• [x] TOML configuration deprecated
• [x] Refinement of Builder plugin DSL and some new features
• [x] Fine-tuned configuration lifecycle and prepare for future where multiple sites can be loaded in memory at once
• [ ] Documentation (in progress)

Note: this is the last version of Bridgetown which will support Ruby 2.7. The next version, Bridgetown 2.0, will be Ruby 3.0 minimum.

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