Eeschema should prompt for Save As in standalone mode

[Ian McInerney]

When using Eeschema in standalone mode, when you add an item to a new (never before saved) schematic and save the file (e.g. Ctrl-S), it automatically saves it as noname.sch in the current working directory without prompting the user. Pcbnew will open the save as dialog when Ctrl-S is pressed in this case, giving the user the opportunity to name it and place it where they want. Eeschema should behave like Pcbnew and give the user the save as dialog.

Note, this current behavior also silently overwrites the noname.sch file that exists in the working directory when saved with the new one. No warning to the user is given that they are overwriting another schematic file.

Application: Eeschema
Version: (5.99.0-366-g56949252b-dirty), debug build
Libraries:
    wxWidgets 3.0.4
    libcurl/7.65.3 OpenSSL/1.1.1c-fips zlib/1.2.11 brotli/1.0.7 libidn2/2.2.0 libpsl/0.20.2 (+libidn2/2.0.5) libssh/0.9.0/openssl/zlib nghttp2/1.38.0
Platform: Linux 5.1.18-300.fc30.x86_64 x86_64, 64 bit, Little endian, wxGTK
Build Info:
    Build date: Nov 14 2019 15:51:44
    wxWidgets: 3.0.4 (wchar_t,wx containers,compatible with 2.8) GTK+ 3.24
    Boost: 1.69.0
    OpenCASCADE Community Edition: 6.9.1
    Curl: 7.65.3
    Compiler: Clang 8.0.0 with C++ ABI 1002

Build settings:
    KICAD_SCRIPTING=ON
    KICAD_SCRIPTING_MODULES=ON
    KICAD_SCRIPTING_PYTHON3=ON
    KICAD_SCRIPTING_WXPYTHON=ON
    KICAD_SCRIPTING_WXPYTHON_PHOENIX=ON
    KICAD_SCRIPTING_ACTION_MENU=ON
    BUILD_GITHUB_PLUGIN=ON
    KICAD_USE_OCE=ON
    KICAD_USE_OCC=OFF
    KICAD_SPICE=ON
    KICAD_STDLIB_DEBUG=OFF
    KICAD_STDLIB_LIGHT_DEBUG=ON
    KICAD_SANITIZE=ON

[KiCad Janitor (kicad-janitor)]

Fixed in revision 39ef514ff9d99a7d69c53172fcac505ddfb9544e
https://git.launchpad.net/kicad/patch/?id=39ef514ff9d99a7d69c53172fcac505ddfb9544e