Feature: Add setting to implicitly enable emoji for all languages

[RoccoCocco]

Description

• Add new flag enableForAllLanguages to enable emoji implicitly on all languages
• Default configuration is false
• Will not impact old configurations

Issue

https://github.com/mattbierner/vscode-emojisense/issues/10

Checks

• [x] Manually tested
• [x] Passes build

[RoccoCocco]

@mattbierner how are we going to proceed with this?

[mattbierner]

Thanks! Instead of adding a new setting, I've instead decided to update the existing languages setting to support:

"emojisense.languages": {
    "*": true
}

This should have the same effect. I've also documented this in the emojisense.languages setting