New layout model

• New layout model that detects more block types, includes ordering, and performs better
• Remove ordering model
• Refactor internals to use common model definitions and processors
• Add flags for easier compilation

What's Changed

• Fix detection results being mutated in place by @iammosespaulr in #236
• Add support for compiled inference by @iammosespaulr in #237
• Dev by @VikParuchuri in #243
• Layout2 by @VikParuchuri in #249
• New layout model by @VikParuchuri in #252

Full Changelog: v0.6.13...v0.7.0