icon 2.0.0+4

An extended Icon for those that are not actually square, plus shadows support.

[2.0.0+4] - 05 APR 21

• Null-safe IconToo.

[1.0.1+3] - 26 FEB 21

• Between 0.1.0 and 1.0.0, parameter trueSize had its @requiredment removed, but the README and documentation did not reflect this.

[1.0.0+2] - 25 FEB 21

• Looked back at the base Icon class and recognized that IconToo ought to support TextDirection, allow a Key initialization, and properly accept and pass a semanticLabel.
• Added a second demo to the Icon Example app.
• Altered some documentation based on hover hints and DartDoc.
• Updated README presentation and sample code.

[0.1.0+1] - 25 FEB 21

• Initial release as a transfer from an Android application on which I am primarily focused.