wxWidgets does not support Dark Mode on OSX Mojave (lp:#1804351)

[Original report](https://bugs.launchpad.net/bugs/1804351) created by **Justace Clutter (justacec)**
```
I am currently running OSX 10.14 in dark mode.  When running in Dark Mode,
many of the dialogs do not render correctly.  Typically it is some form of
white text on a light grey background which makes it hard to read.  (A pain
in the butt actually).

This can be replicated 100% by starting KiCad and opening any of the
"Preferences" dialogues.

This has been discussed (along with an example image) in the user forums on
the KiCad website at https://forum.kicad.info/t/macos-everything-is-white-
text-on-light-gray-background/13668

A web search revealed that this is a bug in wxWindows and they are working
to find a solution.  A link to the relevant discussion is at
https://trac.wxwidgets.org/ticket/18146

I think that a possible good temporary way to move forward is to force
KiCad to not use the Dark Mode until wxWidgets figures out the fix.  This
can be accomplished by editing the
/Applications/KiCad/kicad.app/Contents/Info.plist file by adding a key
"NSRequiresAquaSystemAppearance" and setting that to "true".  Below is my
full Info.plist file:

Info.plist file with added correction
---------------------------------------------------------------------------
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN"
"http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
<dict>
    <key>CFBundleDocumentTypes</key>
        <array>
            <dict>
                <key>CFBundleTypeRole</key>
<string>Editor</string>
                <key>CFBundleTypeIconFile</key>
<string>kicad_doc.icns</string>
                <key>CFBundleTypeExtensions</key>           <array>
<string>pro</string>
                                                        </array>
                <key>CFBundleTypeName</key>
<string>kicad project files</string>
                <key>LSHandlerRank</key>
<string>Owner</string>
            </dict>
        </array>
    <key>CFBundleDevelopmentRegion</key>
<string>English</string>
    <key>CFBundleExecutable</key>
<string>kicad</string>
    <key>CFBundleGetInfoString</key>                <string></string>
    <key>CFBundleIconFile</key>
<string>kicad.icns</string>
    <key>CFBundleIdentifier</key>                       <string>org.kicad-
pcb.kicad</string>
    <key>CFBundleInfoDictionaryVersion</key>        <string>6.0</string>
    <key>CFBundleLongVersionString</key>                <string></string>
    <key>CFBundleName</key>
<string>KiCad</string>
    <key>CFBundlePackageType</key>
<string>APPL</string>
    <key>CFBundleShortVersionString</key>               <string></string>
    <key>CFBundleSignature</key>                    <string>????</string>
    <key>CFBundleVersion</key>                      <string></string>
    <key>CSResourcesFileMapped</key>                <true/>
    <key>LSRequiresCarbon</key>                     <true/>
    <key>NSRequiresAquaSystemAppearance</key>           <true/>
    <key>NSHumanReadableCopyright</key>             <string></string>
    <key>NSHighResolutionCapable</key>              <string>True</string>
</dict>
</plist>
---------------------------------------------------------------------------

I would just make a pull request for the change as it is a 1-liner, but I
just do not know bzr and figured this would be a bit easier.


Version Information from KiCad:
---------------------------------------------------------------------------
Application: kicad
Version: (5.0.1-3-g963ef8bb5), release build
Libraries:
    wxWidgets 3.0.4
    libcurl/7.54.0 LibreSSL/2.6.4 zlib/1.2.11 nghttp2/1.24.1
Platform: Mac OS X (Darwin 18.0.0 x86_64), 64 bit, Little endian, wxMac
Build Info:
    wxWidgets: 3.0.4 (UTF-8,STL containers,compatible with 2.8)
    Boost: 1.67.0
    OpenCASCADE Community Edition: 6.9.1
    Curl: 7.54.0
    Compiler: Clang 10.0.0 with C++ ABI 1002

Build settings:
    USE_WX_GRAPHICS_CONTEXT=ON
    USE_WX_OVERLAY=ON
    KICAD_SCRIPTING=ON
    KICAD_SCRIPTING_MODULES=ON
    KICAD_SCRIPTING_WXPYTHON=ON
    KICAD_SCRIPTING_ACTION_MENU=ON
    BUILD_GITHUB_PLUGIN=ON
    KICAD_USE_OCE=ON
    KICAD_USE_OCC=OFF
    KICAD_SPICE=ON
```
Original tags: dark mac osx wxwindows

Story points: 6.0