Bugfix/state triggering

[pkulev]

Closes issue(s): [ # ]

Description of the changes:

• What's new:

• Fixes:

  • fix Application.state getter's return type
  • add docstrings

• Refactoring:

  • move global variable storing current app instance to protected class variable
  • move trigger_state to Application class
  • rename get_application -> get_application_class

[codecov-io]

Codecov Report

Merging #71 into master will increase coverage by 0.22%. The diff coverage is 82.14%.

@@            Coverage Diff             @@
##           master      #71      +/-   ##
==========================================
+ Coverage   61.05%   61.27%   +0.22%     
==========================================
  Files          42       42              
  Lines        2370     2381      +11     
==========================================
+ Hits         1447     1459      +12     
+ Misses        923      922       -1

Impacted Files	Coverage Δ
xoinvader/tests/conftest.py	84.61% <ø> (-0.57%)	:arrow_down:
xoinvader/menu.py	0% <ø> (ø)	:arrow_up:
xoinvader/ship.py	0% <0%> (ø)	:arrow_up:
xoinvader/game.py	0% <0%> (ø)	:arrow_up:
xoinvader/tests/test_application.py	100% <100%> (ø)	:arrow_up:
xoinvader/application/__init__.py	100% <100%> (+4.22%)	:arrow_up:
xoinvader/state.py	95.45% <50%> (-4.55%)	:arrow_down:

---

Continue to review full report at Codecov.

Legend - Click here to learn more Δ = absolute <relative> (impact), ø = not affected, ? = missing data Powered by Codecov. Last update 3152e8e...e05a8ff. Read the comment docs.