Revert "SOAP-461: Add UTF8 as default file encoding"

This reverts commit e1f7033c50aee54a34e6e345748841f6ecbb472e.

Conflicts:
	soapui-installer/src/dist/bin/soapui.bat
	soapui-installer/src/dist/bin/soapui.sh
	soapui-installer/src/dist_standalone/bin/soapui.bat
	soapui-installer/src/dist_standalone/bin/soapui.sh
	soapui-installer/src/install4j/SoapUI.install4j