Added new multi bootloader helper functions

* Added: functions/bootloaders.sh . This file adds bootloader functions that are heavily used in efi scenarios where a bootloader can act as a first or an extra bootloader.

Since the introduction of the new switch:

--bootloaders

you can setup it like this:

--bootloaders=syslinux,grub-efi

.

This means that syslinux is the first bootloader and grub-efi is the extra bootloader.

* Added new bootloader functions: Check_Non_First_Bootloader and Check_Non_Extra_Bootloader.

These functions let each one of the bootloaders abort the build because
they cannot perform a role either as a first bootloader or as an extra bootloader.

* Added bootloader functions: Check_First_Bootloader_Role, Check_Extra_Bootloader_Role and Check_Any_Bootloader_Role

These functions let bootloaders to force their default role in a single line.

At the same time many binary bootloaders were rewritten to make use of the new bootloader role functions explained above.

These roles were enforced:

binary_grub-legacy : First bootloader
binary_grub-pc : Either first or extra bootloader
binary_syslinux : Either first or extra bootloader

If a bootloader is tried to be used in a role that it's not meant to be used then the build fails because that might lead to a non-bootable system.

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