Refactor ErrorWindow.createStackTraceArea

[javier-godoy]

Refactor createStackTraceArea so that the "stack trace area" can be an arbitrary Component instead of a TextArea

ErrorWindowAddon/src/main/java/com/flowingcode/vaadin/addons/errorwindow/ErrorWindow.java

Line 186 in c35ede7

protected TextArea createStackTraceArea() {