Implement a stdlib API

[maul-esel]

A complete stdlib API

This pull request adds a complete, working and fully-usable stdlib API for complex usages. It features release management, retrieval of published releases and acceptance or rejection of suggested libraries for the stdlib.

It replaces the almost unusable current way where a lib either has the default_include attribute or not.

Todo

Release management

• [x] list releases
• [x] create release
• [x] publish releases
• [x] delete unpublished releases
• [x] describe releases
• [x] modify unpublished release metadata

  Candidate acception

• [x] See #25 (must be merged in here before this PR can be merged).

  Pending items

• [x] See #28 (must be merged in here before this PR can be merged).

  Items

• [x] List items in any stdlib release + including releases

  Documentation

Alongside with development on this, the WIKI documentation is updated. See here.

[maul-esel]

Added more API tasks to support to the PR description.

[maul-esel]

Almost all planned features implemented now. Will add one more feature and some cleanup before merge.