* [user panel] combined 7 commits into 1:
[user side nav] added 'fold/unfold' for the sidebar
[redesign] redesigned toolbar for 'my libs' & 'shared with all'; redesigned 'top bar' for 'help', 'clients' and other pages
[Shared with all] 'share existing libraries' dialog: added the 'close' icon back, enabled clicking outside to close the dialog
['Invite Guest' page] redesigned the toolbar
['Share Admin' - 'Links'] 'Share Links' page: redesigned the toolbar
['Share Admin' - 'Links'] 'Upload Links' page: redesigned the toolbar
cleaned up code
* [user side panel] update
* [user panel] update
* [code style] update: remove an eslint warning
* [top bar, side panel] modified UI of the top bar; redesigned the side panel(moved the content in the bottom to the side nav)
* [font icons] updated the 'department' & 'invite Guest' icons
* [linked devices] moved it from the 'home' side panel to the 'settings' page
* ['settings' page] redesigned the empty tip for 'linked devices'
* [side nav] redesigned it: added a new item 'Files', and made 'My Libraries' and some other items as its sub nav items
* ['Files'] added new page 'Files'(added 'My Libraries' to it)
* ['Files'] added 'Shared with me' to it
* ['Files'] added 'Shared with all' to it
* ['Files'] added 'Shared with groups' to it (removed 'details' for 'department')
* [top toolbar] fixed the position of the vertical line between 2 sides
- fixed it for all the pages
- removed the duplicated 'div.main-panel' in 'lib-content-view'
* [search] modified the UI
* [top toolbar] redesigned the notification
* [top toolbar] avatar & the triangle: modified the UI
* [left side panel] updated the UI; fixup & improvement
* [misc] modified links' color, op-icon, and etc.
* [misc] updated UI for share dialog, other dialogs, & 'more operations' dropdown
* [misc] UI: modified markdown side panels, comment panels, input/textarea placeholder
* ['user settings' page] modified UI
* [shared dir upload link page] modified the UI
* [user settings] modified the UI
* [user settings] fixup
* [seafile-ui.css] use an updated one (modified color of buttons)
* [OCM] modified the icon in 'side nav'
* [OCM] share dialog: improved 'Server select', 'user input', 'submit' and etc.
* [OCM] share dialog: fixup & improvement for 'delete an item' and etc.
* [OCM] 'Shared from other servers' page: fixup & improvement
* [OCM] dir view: fixup & improvement
