feat: added memory allocation presets to minecraft and cluster settings

[rozwader]

Description

Added memory allocation presets dropdown inside settings/minecraft and cluster settings

• Biggest preset leaves 2GB of room for the system (Computer with 16GB of RAM has the biggest preset capped out on 14GB), but he can input his whole RAM into the input (Aka we do not propose his MAX amount of RAM inside presets).
  Also added validation for the memory allocation input (User cannot enter more MB of ram than his computer contains).

The cluster memory setting has priority over minecraft settings (if someone choosed 4GB inside minecraft settings, but choosed 8GB inside cluster settings, game will start with 8GB of memory).

Related Issue(s)

#573

How to test

Minecraft settings

1. Go to minecraft settings, scroll down to memory allocation option.
2. There will be a dropdown for memory presets.

Cluster settings

1. Go to cluster settings, scroll down to memory allocation option.
2. There will be a dropdown for memory presets.

Documentation

No