Fix multiline string properties (#75)

* Test for multiline object properties.

* Fix parsing of multiline string properties.

pytiled_parser/parsers/tmx/properties.py

@@ -12,11 +12,10 @@ def parse(raw_properties: etree.Element) -> Properties:
  for raw_property in raw_properties.findall("property"):
  type_ = raw_property.attrib.get("type")
 
- if "value" not in raw_property.attrib:
+ value_ = raw_property.attrib.get("value", raw_property.text)
+ if value_ is None:
  continue
 
- value_ = raw_property.attrib["value"]
-
  if type_ == "file":
  value = Path(value_)
  elif type_ == "color":

tests/test_tiled_object_tmx.py

@@ -129,6 +129,9 @@
  <property name="float property" type="float" value="42.1"/>
  <property name="int property" type="int" value="8675309"/>
  <property name="string property" value="pytiled_parser rulez!1!!"/>
+ <property name="multiline string property">Hi
+I can write multiple lines in here
+That's pretty great</property>
  </properties>
  </object>
  """,
@@ -144,6 +147,7 @@
  "float property": 42.1,
  "int property": 8675309,
  "string property": "pytiled_parser rulez!1!!",
+ "multiline string property": "Hi\nI can write multiple lines in here\nThat's pretty great",
  },
  ),
  ),