We don't want the log to spam every time this parameter is used so only
complain from the parses when the value is changed.

Fix some indentation issues and make sure everything* uses CamelCase.

* MonitorArrangement is left as snake_case in order to pretend it is an
  independent FLTK widget class.

The user might not always want to use all monitors when in fullscreen
mode, but instead only a few. This commit adds support for configuring
selected monitors from command line, in the config file and graphically
in the options menu.

Because it might be hard to guarantee the consistency of monitor
identifiers coming from third-parties (for example FLTK), it has been
decided to use our own numerical identifier. This identifier is based on
the monitor's positions. The mapping between this identifier and the
indices used by FLTK is done by MonitorIndicesParameter.

Let's avoid making this too complex and force every user to know about
magical functions.

There is already an implicit connection between them, so let's make
it explicit. This allows easy lookup outside of the processMsg() function.

certificates. (Guillaume Destuynder)


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