Mac Bundle Fixes

[Ericzklm]

Various fixes relating to the MacOS SerialPrograms app bundle

• Modifying external filepaths to use the .app base directory instead of the executable's Contents/MacOS/ directory
  • Needed in order to enable SerialPrograms.log and other dumps. This stops the program from attempting to write in write-protected space inside the bundle
  • Needed to avoid collision between the SerialProgram's "Resources" folder and the "Resources" folder automatically defined in the .app bundle
• Modified the location of the SerialPrograms.log to use an absolute filepath located outside the .app bundle for MacOS
• Created an Apple Icon Image file and linked it to the .app bundle during build

[Gin890]

Thank you for the PR. I tried to add an icon image to the program but for some reason I could not get it working. The compiled program did not show the icon correctly. Hope this PR solves that!

[Ericzklm]

Sorry didn't get a chance to follow-up before the merge.

The IconResource folder looked to contain only icon related files so I thought to stick the icon.icns in there as well. It can be moved into the SerialPrograms Resources if that's a better location for it.

The Icon should work! I was confused for a bit because the Icon wasn't showing up when it should have but the problem was just that Finder had cached the blank icon.