wbo is now more observable

(and add type annotations)

* Add mover skeleton

Atm it is just the eraser with new icons and renamed variables

* The mover not detect the object to move

* We can move ellipses and rectangles

* The mover now moves all types of objects

* Add the move everything functionality

* Aesthetic changes

* Replace the use of const and let with classic var

* Undo few commits

* Start the transform-translate implementation

* Mover now moves with transform translate

* Put the function to get the translation matrix in the Tools

* Shapes (ellipse, line, pencil, rect, and text) now properly load translate coords

* Add the transform-translate to the createSVG functions

* Done movement using transform-translate

* Fix parenthesization bug in the SVG create

* Fix comment about mover states

* Undo translation loading from Ellipse, Mover, Pencil, and Text tools

* Makes the board send update message to the mover as needed

* Remove the old code from the line tool too

* Simplify the mover tool

See #86

* update the mover icon

* Merge the mover and the hand tools

* Improve preview for pre-rendered elements

* v1.6.0

Co-authored-by: Paolo Bolzoni <paolo.bolzoni1@studenti.unipr.it>

* add option to block tools

* use tool name instead of computing an id

Co-authored-by: Ophir LOJKINE <ophir.lojkine@auto-grid.com>

* require comma separated list as input of blocked tools environment variable

Co-authored-by: Ophir LOJKINE <ophir.lojkine@auto-grid.com>

* Log attempts to use blocked tools

Co-authored-by: Ophir LOJKINE <ophir.lojkine@auto-grid.com>

* fix syntax

* require tool names to not have a comma in them

* Update server/configuration.js

Co-authored-by: Ophir LOJKINE <pere.jobs@gmail.com>

* Added cursors

* Prepare cursor code for future settings to toggle cursors on or off.
Let cursor be the color the person has currently selected

* fix cursor on mobile (still won't display it in most cases as there is no hover on mobile but at least it won't throw errors)

* use correct size for cursor

* throttle cursor update rate to dramatically improve performance by eliminating congestion

* fix remote cursor size on desktop

* show own cursor by default and renove offset

* use svg as mouse cursor for pencil to be able to apply a reduced opacity to it and view our cursor

* don't throttle local cursor

* throttle local cursor at an independent higher rate. This could be made user adjustable for low power devices

* remove let and const from client-side code

* get emit count and emit count period from configuration

* reduce network cursor updates a lot to prevent instantly getting banned with the current defaults

* prevent eraser from deleting cursors

* use group inside of svg as drawing area and only delete elements inside it with the eraser

* use transform: translate to move cursors around instead of manipulating x and y directly

* fix: add socket ids to cursor messages

* fix incorrect remote cursor scaling and make local cursor visible again after it has been moved after being hidden due to inactivity

* create cursors in a proper fashion and keep them in a separate group

* scaling has been fixed in a1a5580

* move duplicated cursor creation code to function

* show cursors above content

* pass some of ther server configuration through to the client

* fix bug introduced in a833ce9

* allocate at most half of the allowed traffic to cursor updates

* remove debugging leftover

* use feature detection instead of ua sniffing

Co-Authored-By: Ophir LOJKINE <ophir.lojkine@auto-grid.com>

* fix regression where local cursor color was not updated on color change

* Define the cursor as a tool

* Remove the cursor tool from the UI

* Throttle remote cursor updates, not local ones

* Do not increment notification count on cursor move

* Use only one pencil icon

Use the same image for the pencil icon in the menu
and the pencil cursor that appears while drawing

* Add a test for the new cursor feature

* only stop drawing remote cursor when using some tools and always draw local cursor

* increase idle period before hiding cursor

* change idle duration back and set whether a cursor should be sent when using a tool in the respective tool

Co-authored-by: Robert Beach <rdbeach@gmail.com>
Co-authored-by: Ophir LOJKINE <ophir.lojkine@auto-grid.com>
Co-authored-by: ophir <pere.jobs@gmail.com>

This reverts commit b35e0207df.

Co-authored-by: Finn Böger <finnboeger@googlemail.com>

This makes the code more readable.
Also add the automatic deletion of empty board files.

This reverts commit fcac7acc38.

Unload boards from memory when that last connected user goes away.

This is the last feature I wanted before switching to 1.0.

Some work was done on the client-side too, and board loading should now be much faster.