VBE_RM: more general vbe realmode interface, fnc renamed to BIOSinterruptcall

register esi can be now passed to interrupt call and value after that call
esi register is returned back in structure for registers

interrupt number can be specified and passed as function parameter

idtr is preserved

usages of original vbe_realmode_if() were refactored to current
BIOSinterruptcall(uint8_t intNO)
VBE_RM: refactorization of defines and data items related to BIOSinterruptcall

the BIOSinterruptcall is more general and names of related items should
correspond to it, parts of names of these items consisted of terms related
to specific function usage (namely there were 'VBE' and 'VESA' terms),
these were refactorized to more general terms ('INT' and 'RM_INT')
VBE_RM: reference interrupt number used by name to make code more readable
VBE_RM: move vesa init call on RTEMS startup after GDT registers are filled and .bss zeroed

this operation made in start.S allows to remove loading GDT register
in fb_vesa_rm.c next it allows to remove code preserving data items
in .bss
VBE_RM: cleaned unused stuff
VBE_RM: comment rewriten to better describe claims on input parameter
VBE_RM: removed not necessary zeroing of structs parts

initialy it was introduced because of debugging purposes