Keybinding to ungrab keyboard and mouse while drawing remains at the top.
To be aware that this create some problems with the shell (DnD #1 and maybe more ?).
related to #6, #9, #20, #24, #33
* `SCALE_PRESERVE` (preserve ratio)
* `SCALE` (vertical, horizontal or both)
There is a third transformation, `SCALE_ANGLE`, that is not used because it causes problems to the `elementFinder`. Probably a bug of Cairo.inStroke that do no consider scales.
* 'Shapes' -> 'Tools' ('Shapes' + 'Manipulations')
* 'TextState' -> 'TextStates'
* Rotation centers are now computed dynamically (when building Cairo or SVG paths).
* Text rotation center is now located at the beginning of the text.
* Text elements gain a 'lineIndex' attribute to retrieve the rotation center of the first line.
Pointer movement is ignored when the `space` key is held.
To ensure [Screenshot Tool](https://extensions.gnome.org/extension/1112/screenshot-tool/) extension compatibility, we need a way to let the third extension select the screenshot area with pointer but without leaving drawing mode and without drawing.
As a side effect, it allows to insert straight line segments in free drawing (after releasing the key).
Fixes issue #20
* Use a "drawOnYourScreen" subdir in the xdg user data dir
* Info item with the name of the last saved/open json file
* "Open drawing" sub menu with data dir content
* "Save drawing" sub menu with entry
* "Save", "Open previous" and "Open next" keybindings
* use var to export extensionJs.manager
* remove duplicated (old) buildPrefsWidget
* set OsdWindow.HIDE_TIMEOUT in a try/catch because HIDE_TIMEOUT is not exported with 'var'
* capture i in callbacks in for(){} (i is changing)
* add 3.24 version as supported
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