Update 1.2.0 - Postprocessing and localization

Changelog:

> Added more postprocessing effects (visible without bugs).

> Added bugs based on newly added postprocessing effects.

> Fixed a mouse cursor bug (the real one).

> Added polish language (you can choose it through the Options menu, unfortunately - no polish characters in some texts, because of font).

> Improved a hitbox of main character.

> Fixed a bug that you can jump twice on enemy's corpse.

> Added a new enemy - Deadly Glitch Mob, that kills you with bullets.

> Added Game Jolt API to the project.

> Added high-score support (and also down-score) - only on Game Jolt.

> Changed spawn of spikes, etc.

> Added 4 trophies that can be gathered through Game Jolt API.

> Improved design of Main Menu.

> Added special music that plays when your character is close to the Deadly Wall of Glitches.

> Added a new sound effect when you jump on head of glitches/ghosts.

> Added a new section for the Options menu - Gameplay.

> Added Fast Mode to the Options menu.

> Fixed bugs with start countdown.