opt-depend on `default`

Not sure if this is delusional but it would be nice if the technic mod only does an opt-depend on default

Use-case:

• Supporting different games than the minetest_game

Obvious tasks:

• Disable recipes with default nodes (different base-games should provide their own recipe or PR a recipe here)
• ^ Same with grinder,compressor,etc recipes
• Internalize used textures from the default mod
• Remove hardcoded nodes from default (or disable them if not available) drill/laser for example

More problematic tasks:

• Handle transient dependencies on default somehow (pipeworks and basic_materials hard-depend on default)

Reality checks/suggestions welcome 😉