Customize colour

[KVLIAO]

related to #93

Added: src\main\java\dev\xpple\seedmapper\command\arguments\BlockColorConfig.java
Added: src\main\java\dev\xpple\seedmapper\command\commands\BlockColorCommands.java
Modified: src\main\java\dev\xpple\seedmapper\command\arguments\BlockArgument.java

I am trying to implement this feature. But due to network and device limitations, I am unable to debug these codes and hope someone can help me. Forgive me if you encounter some strange bugs or can't even compile this code, but I can do nothing to this.

/blockcolor set - Set block color (color can be a decimal integer or hexadecimal value)
/blockcolor reset - Reset a single block's color
/blockcolor resetall - Reset all block colors
These commands need to be modified and are temporarily in use.

[KVLIAO]

I'm very sorry, there was an obvious typo in the branch name "costomize colour". After I renamed it to "customize colour", the PR #94 was automatically closed. However, I didn't know how to reopen it, so I could only create a new PR. Please forgive me.

[KVLIAO]

On some compilers, displaying Chinese characters may cause errors. I have used some Chinese in the code comments. You can simply use a translator to convert them into English and then overwrite these comments.