Add a code formatting template for Eclipse

Eclipse has a powerful code formatter; by providing a standardized
code formatter template, we'll be able to make it much easier to keep
consistency with a single code formatting style.

Suggested by Greg Domjan.

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Do not use inner spaces in for loop declarations
Do not ever put the opening brace on a new line
Do not use inner spaces in if statements
Use tabs instead of spaces
Indent cases of switch statements

This better matches the current code style.