add: minesweeper PDA game

[ROdenFL]

What Does This PR Do

Adds new basic pda app "Games" with only one game: Minesweeper. RMB for flags, LMB for check cell.

Also, i'd like to do less string operations, but i don't see any ways of it for now.

CSS and JS modificated by @AyIong

Why It's Good For The Game

People can play minesweeper, instead of doing work, just like irl.

Images of changes

Testing

Played a lot. Winned sometimes.

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Declaration

• [x] I confirm that I either do not require pre-approval for this PR, or I have obtained such approval and have included a screenshot to demonstrate this below.

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Changelog

:cl: add: minesweeper game in pda /:cl: