Breaking changes

change signature of getEvents method of Options (and ConfigurationOptions), Legend, Tooltips classes and all plugins instances, returning a Set of events instead of a List.
change signature of getElements method of ChartPointer plugin, returning a Set of pointer elements instead of a List.
change signature of ClickCallback, DoubleClickCallback, EnterCallback and LeaveCallback classes of AnnotationPlugin, adding new event argument in order to get also the event generated on the canvas.
change signature of ClickEventHandler, EnterEventHandler and LeaveEventHandler classes of DataLabelsPlugin, adding new event argument in order to get also the event generated on the canvas.
remove toCSSFontProperty methods from Utilities class. Use Helpers.get().toFontString instead.

Features

import CHART.JS TREEMAP controller version v1.0.2.
- enable tree map chart type.
import CHART.JS MATRIX controller version v1.1.0.
- enable matrix chart type.
import CHART.JS SANKEY controller version v0.8.0.
- enable sankey chart type.
import CHART.JS version v3.5.1.
import CHART.JS GEO controller version v3.5.1.
import CHART.JS LUXON adapter version v1.1.0.
import LUXON library version 2.0.2.
add toasting utility.
add click, enter and leave subtitle events.
add subtitle item to PointElement enumeration for ChartPointer plugin, in order to enable the changing cursor when a click event handler has been set on subtitle element.
add isPressed(event) methods to ModifierKey enumeration in order to enable the capability to filter the events if the modifier keys are pressed.
add align property, as a double representing the clockwise angle (in degree), to DataLabels options in order to define the label box alignment relative to anchor.
add getRelativePosition method to Helpers class in order to get the relative position of an event on the chart.
add modifierKey property to DatasetsItemsSelector options plugin in order to enable the selection only when a modifier key is pressed.
enable programmatically selection on a chart by DatasetsItemsSelector plugin.

#58 removes usage of .getClass().* and .class.* methods to get metadata in order to use CHARBA also with -XdisableClassMetadata or -XnoclassMetadata GWT compiler options. Thanks @MartinSchwarzbauer.

#65 changes OpenJDK distribution in GitHub Actions, using now Zulu. Thanks @carldea.
change dependency for Google Closure Compiler, version v20210808.
add dependency to Google Closure Stylesheets, version 1.5.0.
rename parse method of JSON class to parseForObject, to parse a string to a native object.
add parseForArray method of JSON class to parse a string to an array.
move getStringProperty and getIntegerProperty from Id class to JsHelper one.
use outerHTML property to get HTML string of an element instead of innerHTML with a temporary parent or a cloned instance.
reduce visibility of the classes of injectable resources provided out-of-the-box.
use Chart.helpers.toFont method of CHART.JS to normalize the font object and to get the CSS string.
add additional checks about the consistency of datasets types and amount added to a chart.
add additional checks about the consistency of axes types and amount added to a chart.
add additional checks on builder classes in order to be consistent with new object creation.