Extract bridge. custom syntax into own data package

[solvedDev]

Store all data related to bridge. custom syntax within its own data package. Storing them within the "minecraftBedrock" package is a bit unintuitive.

Changes to data loading within the core app are required to make this work:

• Load presets from multiple packages
• Load file definitions from multiple packages
• Loading typescript declarations might need a tweak to respect the base package path of the file definition

Changes to the bundling script within the editor-packages repo are needed:

• We still need to produce a single fileDefinitions.json file for the standalone version of Dash to consume