Read and cache share information from local and parent folders

[PVince81]

When located in a folder "a/b/c" we should also read the share information from "b" and "a".

Parent shares

• read share information from parents, likely using OCS Share API through owncloud-sdk:
  • OC 10 getDirShareInfo: https://github.com/owncloud/core/pull/36572/files#diff-
  • OC 10 getPathShareInfo for recursive fetching: https://github.com/owncloud/core/pull/36572/files#diff-dafefd9519924bec4efa9f5af4af8e68R1804
  • OC 10 fetching share info from specific directory: https://github.com/owncloud/core/pull/36572/files#diff-dafefd9519924bec4efa9f5af4af8e68R1782
    dafefd9519924bec4efa9f5af4af8e68R1755
• don't render the folder contents until this information has been retrieved
• cache information in the store, useful when user traverses from "a" to "b" to "c". since we already loaded share info for "a" we can keep it in cache as we'll need that as parent info when navigating into "b"
• clear cache when switching to another branch like when switching from "a/b/c" to "x/y/z"
  • OC 10 approach here: https://github.com/owncloud/core/pull/36572/files#diff-dafefd9519924bec4efa9f5af4af8e68R1839

Current folder shares

• load current folder oc:share-types

[PVince81]

WIP PR here #2877

[PVince81]

Fixed through #2877