fix: display alternate pin functions in sch symbol (#154)

Author: XiangYyang

src/kicad/schematic.ts

@@ -1404,7 +1404,7 @@ export class SchematicSymbolInstance {
 export class PinInstance {
     number: string;
     uuid: string;
-    alternate: string;
+    alternate?: string;
 
     constructor(
         expr: Parseable,

src/viewers/schematic/painters/pin.ts

@@ -201,7 +201,7 @@ export class PinPainter extends SchematicItemPainter {
     draw_name_and_number(gfx: Renderer, pin: PinInfo) {
         const def = pin.def;
         const libsym = pin.pin.parent.lib_symbol;
-        const name = def.name.text;
+        const name = pin.pin.alternate ?? def.name.text;
         const number = def.number.text;
         const pin_length = def.length;
         const hide_pin_names = libsym.pin_names.hide || !name || name == "~";