Initial version 0.1.0 changes from original repository

Development of Spring Batch Excel continued in the original repository at
http://github.com/mdeinum/spring-batch-excel.git, with this commit we transfer all fixes, updates and new features in one go to the Spring Batch Excel repository.

The most important changes are:
- Moved to new location org.springframework.batch.extensions
- Removed support for JXL
- Initial support for reading XLSX files streaming
- Upgraded dependencies to most recent versions
- Support for reading password protected files
- Numerous small fixes

Fixes: 10,11,19,26,29,34
Closes: 13,14,30,35,50

spring-batch-excel/.editorconfig

@@ -0,0 +1,10 @@
+root = true
+
+[*.{adoc,bat,groovy,html,java,js,jsp,kt,kts,md,properties,py,rb,sh,sql,svg,txt,xml,xsd}]
+charset = utf-8
+
+[*.{groovy,java,kt,kts,xml,xsd}]
+indent_style = tab
+indent_size = 4
+continuation_indent_size = 8
+end_of_line = lf