Added omwquery

Currently supports depends queries.

TODO:

• depgraph - list dependencies of a mod up to a set depth
• hasuse - list mods that have a given use flag
• meta - pretty print metadata for mod
• uses - pretty print use flags and their descriptions for a mod

equery has a bunch of other features, but many of which we may not have a use for.

Update: Merging what functionality is already present and moving this TODO to an issue