DUB enhancement proposals

The following list contains proposals for extending DUB's functionality. Everyone can add a proposal. It should reasonably describe all relevant interactions and must be specified in detail, so that an implementation can be derived from it.

ID	Description	Status
DEP1	SDL based package format draft	Implemented
DEP2	Separate compilation and caching of dependencies	Implemented
DEP3	Support DUB package based extensibility	Draft
DEP4	Control flow directives	Draft
DEP5	C/C++ support	Draft
DEP6	Git support	Draft
DEP7	Tree based package format	Draft
DEP8	Allow DUB-publishing from privately hosted repos	Draft