Breaking: #3 - Change main navigation constants and setup typoscript paths 

See https://jira.typo3.com/browse/THEP-174

Description 

We decided to group all settings of the main navigation to get a nicer overview of all constants and the setup given in the higher education package.

The default main navigation settings of the higher education package are defined in EXT:higher_education_package/Condiguration/TypoScript/Constants/main-navigation.typoscript and EXT:higher_education_package/Condiguration/TypoScript/Setup/main-navigation.typoscript

Constants 

Old main navigation constants 

plugin.tx_highereducationpackage {
    settings {
        # cat=higher education package: navigation/115/MainNavigation; type=options[Twist=twist,Paternoster=paternoster,Curtain=curtain]; label=Set animation for main navigation
        mainNavAnimation = twist

        # cat=higher education package: navigation/115/MainNavigation; type=int+; label=Set target uid for main navigation
        mainNavStartpointUid = 2
    }
}
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Changed main navigation constants 

plugin.tx_highereducationpackage {
    main-navigation {
        # cat=higher education package: navigation/115/MainNavigation; type=options[Twist=twist,Paternoster=paternoster,Curtain=curtain]; label=Set animation for main navigation
        animation = twist

        # cat=higher education package: navigation/115/MainNavigation; type=int+; label=Set target uid for main navigation
        startpointUid = 2
    }
}
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Setup 

Old main navigation setup 

lib.mainNav {
    ## get the animation style for main navigation
    animation = TEXT
    animation.value = {$plugin.tx_highereducationpackage.settings.mainNavAnimation}

    ## get backgroundimage for main navigation
    image = IMG_RESOURCE
    image {
        file {
            import.data = levelfield:-1, menu_image, slide
            treatIdAsReference = 1
            import.listNum = 0
        }
    }
}
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Changed main navigation setup 

plugin.tx_highereducationpackage {
    main-navigation {
        ## get the animation style for main navigation
        animation = TEXT
        animation.value = {$plugin.tx_highereducationpackage.main-navigation.animation}

        ## get backgroundimage for main navigation
        image = IMG_RESOURCE
        image {
            file {
                import.data = levelfield:-1, menu_image, slide
                treatIdAsReference = 1
                import.listNum = 0
            }
        }
    }
}
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Changed main navigation startingPoint assignment in page menu processor 

Old assignment in file EXT:higher_education_package/Configuration/TypoScript/Setup/page.typoscript

page.10.dataProcessing.10.special.value = {$plugin.tx_highereducationpackage.settings.mainNavStartpointUid}
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New assignment

page.10.dataProcessing.10.special.value = {$plugin.tx_highereducationpackage.main-navigation.startpointUid}
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Changed main navigation fluid partial 

Updated main navigation animation and image cObject setup assignment in fluid partial EXT:higher_education_package/Resources/Private/Partials/Page/MainNav.html