spacenavd 1.4

Changes in v1.4

• Linux: add universal keyboard emulation support through uinput (no X11 dependency).
• UNIX domain socket path is now configurable.
• allow the user to override default pid-file.
• add USB id for spacemouse pro wireless BT.
• add support for multi-key button presses.
• initial support for button hold mappings.
• various other minor bug fixes.