"i3-colors Project Todo List"

Refactoring [0/3]:
- Change src/parser.py name
- Change src/theme.py name
- Improve function/variables names
YAML Theme Parser [0/1]:
- Improve yaml theme loader reliability
Theme applying algorithm [0/2]:
- Improve efficiency
- Assume that theme to apply is well formated (checked in YAML Theme Parser)
General [0/1]:
- Improve user API