Add ability to pin posts

Closes #468 (closed)

(based on !739 (closed))

NOTE: I've removed "pinned" timeline and its polling logic. Instead, I came up with a more elegant way to filter pinned statuses from the "user" timeline.

Screenshots

mentioned in merge request !739 (closed)

added 1 commit

• 43c37670 - revert removeStatus changes

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added 1 commit

• 405852d4 - clean up fetchPinnedStatuses api service

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added 1 commit

• bc2776b1 - clean up

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added 1 commit

• 2f3ed91f - clean up

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added 1 commit

• 32ed5aae - show immediately pinned statuses

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changed the description

on pleroma.site, pinning posts on this branch makes a request to /undefined.

could you provide me steps to reproduce?

write a post, go to my profile, click "pin this post"

it works great on my end. could you provide me a full URL of the request?

i feel that "Pinned" label should actually be left aligned.

Might be better on the left, but not sure. I don't think it matters too much especially for the first version

added 26 commits

• 32ed5aae...e351f863 - 3 commits from branch pleroma:develop
• 94e1f15f - #468 (closed) - integrate endpoints
• e4356af7 - #468 (closed) - add pin icon
• 2fed227e - #468 (closed) - pin/unpin status
• 687c1dd4 - #468 (closed) - show pin for own statuses only
• 310a5604 - #468 (closed) - show pinned timeline and add pinned label to the status
• d823a76d - #468 (closed) - remove unpinned status from timeline
• 18b60aee - #468 (closed) - update pinned status after actions(remove, add)
• fdb12bf1 - #468 (closed) - show pin status API error
• ce607b0a - #468 (closed) - clean up
• 3ee3b016 - #468 (closed) - fix plus button size issue, use scss variable properly
• 87b93445 - #468 (closed) - add ellipsis font icon
• 505933ad - #468 (closed) - add extra buttons for status actions
• 3bd8b111 - #468 (closed) - shwo pin button for valid statuses (public & unlisted)
• 3b7ce8f4 - #468 (closed) - hide status menu after action button is clicked
• 89a1d27d - revert pinned timeline polling logic
• fde1df2b - remove pinned timeline, instead, use simple entity of user object
• 46d7218e - filter pinned statuses based on pinned entity instead of a separate user entity
• 191bfd70 - refactor pin/unpin status logic
• eb23dd21 - refactor error handling of pinStatus
• fdb35ed3 - revert removeStatus changes
• 9cc14858 - clean up fetchPinnedStatuses api service
• 3d5bfce7 - clean up
• 1fca18ba - show immediately pinned statuses

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