Use Mojang API instead

[boomboompower]

The mod will work better if it doesn't rely on third party websites. An option to use them may still be kept in-game, however the default should be the official mojang api.

Here's a rundown of the requirements:

• [x] Create module to covert a username to UUID https://github.com/boomboompower/SkinChanger/commit/e0a0daf2d9f2b83de0f4b0860da528c84ea8e049
• [x] Write hooker for Mojang api https://github.com/boomboompower/SkinChanger/commit/e0a0daf2d9f2b83de0f4b0860da528c84ea8e049
• [x] Write loader for skins from the api https://github.com/boomboompower/SkinChanger/commit/861c85b4db280808e912b9afa0a284ebb6024326
• [x] Test across versions / test api.

[boomboompower]

Has been implemented for a while. Went under the radar