Make default protocol configurable

Review Request #128496 - Created July 22, 2016 and submitted - Latest diff uploaded

Information
Arno Möller
krdc
master
Reviewers
kdeutils
uwolfer

Add a new config option for the default protocol.
Default protocol: protocol to use when passing a hostname via command line without a scheme.
~~
$ krdc my.host
~~
expands to vnc://my.host since the dawn of time. With the default protocol set to "rdp" it expands to rdp://my.host

The default protocol defaults to vnc to keep the current behavior.

It's a QString because I have no clue how to gather the supported protocols from all installed plugins.

$ krdc my.host

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