Update icons Mac OS & Windows

Current icons are displayed incorrectly on mac OS ;

We should switch to icon colors matching the OS theme , using svg and monochrome color ranges.

Notes:

• Never use JPEG, always PNG, inside "packaged" icons
• SVG: use base size of 16x16px
• ICO: multi-resolution (https://www.axialis.com/tutorials/tutorial-vistaicons.html)
• ICNS: format ic14, multi-resolution (https://en.wikipedia.org/wiki/Apple_Icon_Image_format)

General:

• app_icon.svg

System tray:

• systray_asleep.svg
• systray_disabled.svg
• systray_enabled.svg
• systray_stopped.svg
• systray_update_avalaible.svg

macOS:

• app_icon.icns
• folder_mac.icns

Windows:

• app_icon.ico
• folder_windows.ico
• wizard.bmp (http://www.jrsoftware.org/ishelp/index.php?topic=setup_wizardimagefile)
• wizard-small.bmp (http://www.jrsoftware.org/ishelp/index.php?topic=setup_wizardsmallimagefile)

Current icons are attached to this ticket