send current screen refresh rate to retroarch
use .cfg for dispmanx configuration to bring it in line with the videomodes config naming
added "runcommand.sh" to emulators that missed it so that they can benefit from user configured video output switching
add an additional parameter for runcommand which will be used for saving of the video output mode and display in the menu.
we pass the module id in, which is short and should be clear to the user if manually fiddling with the config. if the parameter is
empty, it the name of the binary will be used
use the emuname for dispmanx setting (module id if it is passed)
fix up the prefixing of library to command for dispmanx
we are using module id now for dispmanx setting
Merge remote-tracking branch 'upstream/master' into more_runcommand_improvements

Conflicts:
	scriptmodules/emulators/dosbox.sh
no need for binary variable now, and add some comments
some additional documentation for the new runcommand.sh
added some brief instructions for users on how to enter the menu
woops - search / replace fail.
Merge pull request #537 from joolswills/more_runcommand_improvements

More runcommand improvements