feat(init): no Cartridge or VIC-II at a Blade's reset and NMI

A Blade has no expansion port for Cartridges and no VIC-II: with
ARNITECH_BLADE the reset neither looks for a Cartridge nor blanks the screen,
and the NMI handler looks for no Cartridge.

src/kernal/init/fce2.hw_entry_reset.s

@@ -45,6 +45,8 @@ hw_entry_reset:
 	; Also, https://codebase64.org/doku.php?id=base:assembling_your_own_cart_rom_image was used
 	; as it shows example startup sequence, to be followe by cartridge creators
 
+!ifndef CONFIG_ARNITECH_BLADE { ; a Blade has no Cartridges and no VIC-II
+
 !ifndef ROM_LAYOUT_CRT {
 
 	; C64 PRG p269
@@ -56,6 +58,7 @@ hw_entry_reset:
 	; Disable the screen (and set 40 columns) to prevent visual glitches later
 	ldx #$28
 	stx VIC_SCROLX
+}
 }
 	; Initialising IO is obviously required. Also indicated by c64 prg p269.
 	jsr JIOINIT

src/kernal/interrupts/fe47.default_nmi_handler.s

@@ -17,13 +17,13 @@ default_nmi_handler:
 
 	; XXX confirm NMIs from CIA, or no other NMI will arrive!
 
-!ifdef CONFIG_PLATFORM_COMMODORE_64 {
+!ifdef CONFIG_PLATFORM_COMMODORE_64 { !ifndef CONFIG_ARNITECH_BLADE { ; a Blade has no Cartridges
 
 	jsr cartridge_check
 	bne @1
 	jmp (ICART_WARM_START)
 @1:
-}
+} }
 
 	; According to C64 Wiki, if STOP key is pressed, the routine assumes warm start request