miktemk - firstUuidGroup: generate just the first 8 characters

[miktemk]

• I added the firstUuidGroup option to the command. I find this option useful to generate 8-char random UIDs which i use as labels throughout my code. This is similar to this plugin I wrote for VsCode
• According to these instructions "Try to improve an existing package before adding another", so I decided to add this functionality on top of your existing package.
• Please let me know if you deem this feature to rather be in its own Sublime package.

[FichteFoll]

What about implementing this as a numeric parameter specifying how many groups should be kept? That would leave even more room for user configuration.