WIP: macOS: remove macOS specific menu items

WIP because we're not using 10.12 SDK

Uses macOS Objective-C API to remove automatically added menu items that are useful or even harmful for Inkscape.

• "View > Show Tab Bar" (messes with mouse pointer coordinates)
• "View > Enter Full Screen" (duplicate)
• "Edit > Start Dictation..." (non-functional)
• "Edit > Emoji & Symbols" (non-functional)

Note that some of the NSUserDefaults options only take effect after relaunching Inkscape. And they can be changed by the user with defaults write org.inkscape.Inkscape ....

/cc @dehesselle