Address Sourcery Code Quality Report recommendations

[cleder]

Sourcery Code Quality Report

Here are some functions in these files that still need a tune-up:

File	Function	Complexity	Length	Working Memory	Quality	Recommendation
fastkml/kml.py	_Feature.from_element	21 😞	395 ⛔	8 🙂	36.79% 😞	Refactor to reduce nesting. Try splitting into smaller methods
fastkml/kml.py	_Feature.etree_element	21 😞	287 ⛔	7 🙂	41.68% 😞	Refactor to reduce nesting. Try splitting into smaller methods
fastkml/kml.py	Placemark.from_element	7 ⭐	241 ⛔	10 😞	48.86% 😞	Try splitting into smaller methods. Extract out complex expressions
fastkml/kml.py	_TimePrimitive.parse_str	6 ⭐	146 😞	12 😞	53.78% 🙂	Try splitting into smaller methods. Extract out complex expressions
fastkml/kml.py	KML.from_string	7 ⭐	149 😞	9 🙂	58.19% 🙂	Try splitting into smaller methods

Legend and Explanation

The emojis denote the absolute quality of the code:

• ⭐ excellent
• 🙂 good
• 😞 poor
• ⛔ very poor

The 👍 and 👎 indicate whether the quality has improved or gotten worse with this pull request.

[cleder]

This looks a lot like: https://www.youtube.com/watch?v=8bZh5LMaSmE