Add selection groups
Merge branch 'feature/groups' into development
Add the new cobblestone, metal, and wooden plank materials

Closes #1
Clean up the code for service/asset references
Provide better warnings & HttpService functionality for plugin

This patch renovates the startup message system to include
better, helpful warnings/notifications. It also enables the
plugin version of Building Tools to have access to
HttpService functionality, allowing for usage of features
like exporting.
Allow for importing from regular Studio
Allows the input of decal items in the texture tool

This patch allows users to just input a decal asset instead
of manually having to find the image asset. It uses an external
web API by F3X to extract the right image ID.
Allows the input of arbitrary mesh-containing assets in the mesh tool

This patch allows users to just input any asset containing a mesh
instead of manually having to find the mesh's ID. It uses an external
web API by F3X to extract the right mesh data from the given asset.
Merge branch 'feature/content-extraction' into development
Merge branch 'development'