element.getCTM() returns `null` if one of the transformation matrices
is zero. This fix uses get_transform_matrix instead.

Co-authored-by: sents <finn@krein.moe>

* use join
* don't use arrow functions

Co-authored-by: sents <finn@krein.moe>

add board name for downloaded file

@nneka-nu : please do not change that again

Windows has case-insensitive file names by default,
but wbo itself handles boards with case differences correctly.
If you are using wbo on windows (which I do not recommend),
please set the case sensitivity flag of the folder where you store boards.
Alternatively, use WSL or Docker.

This adds the ability to load a board with the menu hidden; it provides a form of "read-only" mode, but the key bindings are still active.
Use with, e.g.:
http://localhost:5001/boards/qYAZyGdym6HqjnfaGI4yNtpdx0IMHd9qp6kaJPwbJqE-?hideMenu=true

The alternative, proposed in #116, was to remove the menu completely, but this would require more substantial changes to board.js (which hangs on "Loading..." if the menu is removed).
Related to #150
Related to #116

Adds support for query parameter "hideMenu"

This adds the ability to load a board with the menu hidden; it provides a form of "read-only" mode, but the key bindings are still active.
Use with, e.g.:
http://localhost:5001/boards/qYAZyGdym6HqjnfaGI4yNtpdx0IMHd9qp6kaJPwbJqE-?hideMenu=true

The alternative, proposed in #116, was to remove the menu completely, but this would require more substantial changes to board.js (which hangs on "Loading..." if the menu is removed).
Related to #150
Related to #116

This reverts commit 71d8be5df1.

This adds the ability to load a board with the menu hidden; it provides a form of "read-only" mode, but the key bindings are still active.
Use with, e.g.:
http://localhost:5001/boards/qYAZyGdym6HqjnfaGI4yNtpdx0IMHd9qp6kaJPwbJqE-?hideMenu

The alternative, proposed in #116, was to remove the menu completely, but this would require more substantial changes to board.js (which hangs on "Loading..." if the menu is removed).
Related to #150
Related to #116

There is now a separate size for the main pencil and the whiteout tool. This is helpful when using "White-Out" as an eraser and switching frequently, as one typically wants eraser to have larger radius.

* Remember and restore white-out size

* Isolate size toggle in pencil.js

* Undo toggle back to Pencil on tool change, replace Pencil size concept with Drawing size

Co-authored-by: ishabalin <ishabalin@apple.com>

When using an iPad with an apple stylus, finger touches now trigger the whiteout tool.
This behavior can be disabled by setting the environment variable AUTO_FINGER_WHITEOUT=disabled

* Auto white-out with a finger when using stylus

* Add AUTO_FINGER_WHITEOUT config variable

* Use local variable to remember if stylus was used and make behavior configurable

* Delete "stylus" property

* Make AUTO_FINGER_WHITEOUT on by default

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

* Delete parseBool, add note about iPad/Pencil

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

The old behavior was wheel to scroll and ctrl+wheel to zoom.
The new behavior is the opposite.