bugfix: scrolls beyond min/max date not always triggering onChange

Specify the default value for androidVariant prop

So people don't have to search through code to land here: 9403a8e537/android/src/main/java/com/henninghall/date_picker/DerivedData.java (L108)

Add missing androidVariant prop

Add android style variant: "Native Android"

Change default date format for Finnish

Fix zh_* locale parsing

By properly searching for the first undescore

Fix return of wrong pattern piece

The getPatternIncluding method would return quoted pieces if
the check contents of the quoted part included the format letter.

For instance for Danish (da_DK), the pattern is "EEE 'den' d. MMM"
If we are calling `getPatternIncluding("d", "da_DK")`, the method
would return `"den'"´, but we would like to return `"d."`.

This commit ignores pieces with apostrophe ("'") in them.

add zh_CN locale