3d-view, touchscreen interaction has problems with zoom and click

[Thomas Pointhuber]

# Howto reproduce

 1. start 3d-view and try to do some simple gestures like vertical/horicontal drag, zoom or click (pinch/spread)
 2. see the canvas interacting in a way you did not intended (at least for zoom and click)

actual behaviour:

 * pinch/spread: horizontal scrolling
 * click: nothing happens

# Expected behaviour

 at least simple gestures zoom and click should work, to allow navigation on touch systems.

# Version Informations

Application: kicad
Version: (2018-01-03 revision 0945c319f)-makepkg, release build
Libraries:
    wxWidgets 3.0.3
    libcurl/7.54.1 OpenSSL/1.0.2l zlib/1.2.11 libssh2/1.8.0 nghttp2/1.23.1 librtmp/2.3
Platform: Windows 8 (build 9200), 64-bit edition, 64 bit, Little endian, wxMSW
Build Info:
    wxWidgets: 3.0.3 (wchar_t,wx containers,compatible with 2.8)
    Boost: 1.60.0
    Curl: 7.54.1
    Compiler: GCC 7.1.0 with C++ ABI 1011

Build settings:
    USE_WX_GRAPHICS_CONTEXT=OFF
    USE_WX_OVERLAY=OFF
    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_SPICE=ON

[KiCad Janitor (kicad-janitor)]

KiCad bug tracker has moved to Gitlab. This report is now available here: https://gitlab.com/kicad/code/kicad/-/issues/2094