1802 Assembly Language Support in Atom

Adds language support for RCA 1802 assembly to the Atom Editor.

Opcodes exclusive to the 1805 have yet to be added.

Supported toolchains, assemblers, linkers, etc.

This package includes syntax highlighting for assembler directives, labels, etc. for the following toolchains:

I'm happy to add more assemblers as requested. Please use Github's issue function to report bugs or improvement ideas. Contributions are greatly appreciated!