Add debugger port options to general settings

[j0yu]

I noticed in #11 , the debugger settings I made in the main MayaCharm settings were similar to those already existing in MayaCharmDebugForm.

Maybe I can make the:

• Host Name
• Port Number options inherit from a "global" set of options.

Those "global" options can then be used for "attach to local process" in #11

[cmcpasserby]

this is all getting overhauled in the 3.0 version and port to kotlin