Adding support for displaying plugins available variable into Beremiz plugin tree
<?xml version="1.0" encoding="UTF-8"?>
<BeremizRoot CFLAGS="-g" Linker="g++" LDFLAGS="-g">
<TargetType>
<Linux Nice="0"/>
</TargetType>
<Connection>
<Local/>
</Connection>
</BeremizRoot>