feat: add scroll navigation, line-wrap tracking, and wrap-aware editing

- Shift+Up/Down scrolls through program listings with multi-row line
support
- Line-wrap flag bitmap tracks which display rows are continuations
- Home/Shift+Home navigate to start/end of logical wrapped lines
- Ctrl+K clears to end of line including continuation rows
- Backspace and cursor movement work across wrapped line boundaries
- Shift+DEL inserts blank line (like Atari 800)
- LIST output tracks line wrapping for proper scroll navigation
- add Shift+Left/Right word jumps

Author: mbrukner

modules/graphics/drawing/line.asm

@@ -163,8 +163,7 @@ _GXAXExit:
 
 GXIncrementY:
 		inc 	gxY0
-		jsr 	GXMovePositionDown
-		rts
+		jmp 	GXMovePositionDown
 
 
 ; ************************************************************************************************

modules/graphics/drawing/sources/font.asm

@@ -38,8 +38,7 @@ GXFontHandler: ;; <5:DrawFont>
 		lda 	#8 							; size 8x8
 		ldx 	#GXGetGraphicDataFont & $FF ; XY = Graphic Data retrieval routine
 		ldy 	#GXGetGraphicDataFont >> 8
-		jsr 	GXDrawGraphicElement
-		rts
+		jmp 	GXDrawGraphicElement
 ;
 ;		Get line X of the graphics into the Pixel Buffer
 ;