Wrap everything in an installer

[Sofiya-D]

To provide easier setup for users, wrap everything in a single executable (like an installer). It should: OFFLINE:

• ask user where to install
• ask user's language
• (maybe ask any other information needed for the solution, and store it somewhere for reference)
• "unwrap" the base of the project: curl, unzip, mc launcher? (could be downloaded), etc... ONLINE:
• download & install java
• (Download mc launcher ?)
• download & install MultiMC --> maybe get rid of the batch files lying around everywhere & find another way to install ??

-> Allow the installer to run in two stages: 1.offline part; 2.online part. Offline part should be able to "re-run" without issue (if it has already been done before) Online part should be able to inform the user when it fails due to the user being offline, and not ruin the offline part work if it fails.

[Sofiya-D]

For the installation:

• the path given by the user should be where the installation and running files go (instances, java, curl, ect...).
• there should be an easily accessible executable/shortcut, for ease of use.