Update version 0.4

Version 0.4 includes a lot!

Bug fixes:
- flags couldn't be placed properly after resetting 2D

Added: 
- camera controls in 2D (wasd + ctrl + space)
- camera motions for future purposes
- tile preview highlight (pressing on a tile highlights adjacent tiles)
- tile mass clicking (clicking on a number that has flags nearby equal to the amount of bombs reveals all adjacent tiles)
- added 3D minesweeper mode (too easy?)
- added 3D orientation controls (wasd rotates, ctrl + space goes a layer deeper or higher)
- added 3D flag placement system
- added 3D numbers that are always orientated properly
- added 3D no guess start

Improved:
- grid spawning
- grid cleanup
- bomb algorithm
- custom mode (e.g. 100x100 with 1k bombs is playable albeit laggy)
- tile reveal method on empty tiles (tiles with no bombs surrounding them)
- overall performance

This update will also make the game public, but unlisted. This for playtesting sake. If you somehow managed here without being invited by me, please do leave your feedback in the comments. Any feedback is welcome even if I am already aware of it. This is a work in progress with a lot of experimental features in the 3D mode.