Content update 0.3.0

Another small content update. Here's the summary:

Additions
+ New event block: Player Velocity - know when the player's velocity is above or below any given threshold
+ More contextual key combos in the level editor

Changes
* Redesigned the level editor's contextual key combos to be much easier for me to add and change, and the changes should also prevent any future issues or inconsistencies

Fixes
> Laser beam visuals no longer vary in sizes between different resolutions

In the next few updates:
~ Leaderboards
~ More levels
~ New obstacles
~ Backwards compatibility system (will be added before it is necessary)
~ Piston piece (semi-harmless crusher)
~ Steam Achievements
~ Better resolution and display settings
~ Level editor improvements, quality of life, and features
~ Rotation deprecation (replacing with Spin)
~ New background visuals