Add new public API

[ikrivosheev]

@tim-weis hello! Thank you for the great library! My use case: I need to get VBA macros from DOC, XLS containers.

Changes:

• add new public API which get CompoundFile and root path in a container to VBA project
• Add method Package::into_inner
• Upgrade cfb dependence up to 0.7
• Upgrade nom dependence up to 7.1

[tim-weis]

Glad to hear that you find this library useful, Ivan. I haven't found time to look into this PR in detail; at a cursory look it appears to be a useful extension. I'll leave a proper review as time permits (Saturday night, or on Sunday).

In the meantime, could you open a new issue that explains your use case and why it's not currently supported by this library? Having an associated issue makes maintenance easier, and is valuable documentation, too.

[ikrivosheev]

Glad to hear that you find this library useful, Ivan. I haven't found time to look into this PR in detail; at a cursory look it appears to be a useful extension. I'll leave a proper review as time permits (Saturday night, or on Sunday).

In the meantime, could you open a new issue that explains your use case and why it's not currently supported by this library? Having an associated issue makes maintenance easier, and is valuable documentation, too.

Thank you for replay! I have some ideas to improve the library. I will create new issues and PR)

[ikrivosheev]

Glad to hear that you find this library useful, Ivan. I haven't found time to look into this PR in detail; at a cursory look it appears to be a useful extension. I'll leave a proper review as time permits (Saturday night, or on Sunday).

In the meantime, could you open a new issue that explains your use case and why it's not currently supported by this library? Having an associated issue makes maintenance easier, and is valuable documentation, too.

Done: #20