[icedtea-web] Proposed formatting for C++ side of plugin

[Adam Domurad]

So, currently the C++ side of the plugin uses inconsistent indents (tabs
and various # of spaces). An auto-format to make the code formatted more
like the Java side could be beneficial.

As Omair pointed out however, formatting HEAD will cause back-ports to
become more difficult.

 I therefore propose to create an Eclipse formatting profile that will
define the standard formatting for the C++ side of the project, and then
back-port this formatting profile so that future back-ported patches are
not made more difficult due to indenting/line number differences.