chore(generator_version): add attribute to symbol and footprint

Kicad v8 has this attribute defined to "8.0". So once reading/writing this
kind of file the value shouldn't disappear. Keep it backport compatible
with older version, where this attribute does not exist.

Signed-off-by: Andrej Valek <andy@skyrain.eu>

Author: andy9a9

src/kiutils/footprint.py

@@ -716,6 +716,9 @@ def libId(self, symbol_id: str):
     generator: Optional[str] = None
     """The ``generator`` token attribute defines the program used to write the file"""
 
+    generator_version: Optional[str] = None
+    """The ``generator_version`` token attribute defines the kicad version used to write the file"""
+
     locked: bool = False
     """The optional ``locked`` token defines a flag to indicate the footprint cannot be edited"""
 
@@ -864,6 +867,7 @@ def from_sexpr(cls, exp: list) -> Footprint:
                 elif item == 'placed': object.placed = True
             elif item[0] == 'version': object.version = item[1]
             elif item[0] == 'generator': object.generator = item[1]
+            elif item[0] == 'generator_version': object.generator_version = item[1]
             elif item[0] == 'layer': object.layer = item[1]
             elif item[0] == 'tedit': object.tedit = item[1]
             elif item[0] == 'tstamp': object.tstamp = item[1]
@@ -1021,9 +1025,10 @@ def to_sexpr(self, indent=0, newline=True, layerInFirstLine=False) -> str:
         placed = ' placed' if self.placed else ''
         version = f' (version {self.version})' if self.version is not None else ''
         generator = f' (generator {self.generator})' if self.generator is not None else ''
+        generator_version = f' (generator_version {self.generator_version})' if self.generator_version is not None else ''
         tstamp = f' (tstamp {self.tstamp})' if self.tstamp is not None else ''
 
-        expression =  f'{indents}(footprint "{dequote(self.libId)}"{locked}{placed}{version}{generator}'
+        expression =  f'{indents}(footprint "{dequote(self.libId)}"{locked}{placed}{version}{generator}{generator_version}'
         if layerInFirstLine:
             expression += f' (layer "{dequote(self.layer)}")\n'
         else:

src/kiutils/symbol.py

@@ -492,6 +492,9 @@ class SymbolLib():
     generator: Optional[str] = None
     """The ``generator`` token attribute defines the program used to write the file"""
 
+    generator_version: Optional[str] = None
+    """The ``generator_version`` token attribute defines the kicad version used to write the file"""
+
     symbols: List[Symbol] = field(default_factory=list)
     """The ``symbols`` token defines a list of zero or more symbols that are part of the symbol library"""
 
@@ -548,6 +551,7 @@ def from_sexpr(cls, exp: list) -> SymbolLib:
         for item in exp[1:]:
             if item[0] == 'version': object.version = item[1]
             elif item[0] == 'generator': object.generator = item[1]
+            elif item[0] == 'generator_version': object.generator_version = item[1]
             elif item[0] == 'symbol': object.symbols.append(Symbol().from_sexpr(item))
         return object
 
@@ -583,8 +587,10 @@ def to_sexpr(self, indent: int = 0, newline: bool = True) -> str:
         """
         indents = ' '*indent
         endline = '\n' if newline else ''
+        generator = f' (generator {self.generator})' if self.generator is not None else ''
+        generator_version = f' (generator_version {self.generator_version})' if self.generator_version is not None else ''
 
-        expression =  f'{indents}(kicad_symbol_lib (version {self.version}) (generator {self.generator})\n'
+        expression =  f'{indents}(kicad_symbol_lib (version {self.version}){generator}{generator_version}\n'
         for item in self.symbols:
             expression += f'{indents}{item.to_sexpr(indent+2)}'
         expression += f'{indents}){endline}'