Updates to Hex View

[shanedell]

• Update hex view to split up each byte by a space.
• Update hex view to only select the proper byte for variable bytePos1b.
• Update hex view to only open up at the start of debug.
• Update hex view to only update selection when the hexFile is opened.
• Reformatted some of the code that was a bit uncessary.

Fixes #63 , Fixes #65 , Fixes #57

[jw3]

rejected promise not handled within 1 second: Error: ENOENT: no such file or directory, open
/usr/share/code/resources/app/out/bootstrap-fork.js:5
stack trace: Error: ENOENT: no such file or directory, open
    at Object.openSync (fs.js:466:3)
    at Object.func [as openSync] (electron/js2c/asar_bundle.js:5:1812)
    at Object.readFileSync (fs.js:368:35)
    at Object.readFileSync (electron/js2c/asar_bundle.js:5:8583)
    at DebuggerHexView.<anonymous> (/home/code/vscode-mock-debug/dist/ext/extension.js:441:27)
    at Generator.next (<anonymous>)
    at fulfilled (/home/code/vscode-mock-debug/dist/ext/extension.js:250:58)
    at processTicksAndRejections (internal/process/task_queues.js:97:5)

[jw3]

Id say poke around at that data file init a little, if nothing obvious it can be merged and we will sort it out later. Might be my environment and all the churn in this example workspace.