Renamed INITBSS to INIT and INIT to ONCE.

The way we want to use the INITBSS segment - and especially the fact that it won't have the type bss on all ROM based targets - means that the name INITBSS is misleading. After all INIT is the best name from my perspective as it serves several purposes and therefore needs a rather generic name.

Unfortunately this means that the current INIT segment needs to be renamed too. Looking for a short (ideally 4 letter) name I came up with ONCE as it contains all code (and data) accessed only once during initialization.

libsrc/atari/casinit.s

@@ -13,7 +13,7 @@
         .import start
         .export _cas_init
 
-.segment        "INIT"
+.segment        "ONCE"
 
 _cas_init:
 .ifdef  DEBUG

libsrc/atari/dosdetect.s

@@ -11,7 +11,7 @@
 ; ------------------------------------------------------------------------
 ; DOS type detection
 
-.segment        "INIT"
+.segment        "ONCE"
 
 detect: lda     DOS
         cmp     #'S'            ; SpartaDOS

libsrc/atari/getargs.s

@@ -20,7 +20,7 @@ SPACE   = 32            ; SPACE char.
 ; --------------------------------------------------------------------------
 ; Get command line
 
-.segment        "INIT"
+.segment        "ONCE"
 
 initmainargs:
         lda     #0

libsrc/atari/irq.s

@@ -13,7 +13,7 @@
 
 ; ------------------------------------------------------------------------
 
-.segment        "INIT"
+.segment        "ONCE"
 
 initirq:
         lda     VVBLKD

libsrc/atari/mcbpm.s

@@ -180,7 +180,7 @@ update_colors:
 
 ; ------------------------------------------------------------------------
 
-        .segment "INIT"
+        .segment "ONCE"
 
 pm_init:
         lda     #0

libsrc/atari/shadow_ram_handlers.s

@@ -26,7 +26,7 @@ SHRAM_HANDLERS  =       1
 BUFSZ           =       128     ; bounce buffer size
 BUFSZ_SIO       =       256
 
-.segment "INIT"
+.segment "ONCE"
 
 ; Turn off ROMs, install system and interrupt wrappers, set new chargen pointer