WIP installation rules

Signed-off-by: Thiago Macieira <thiago@macieira.org>
Compile the macos.c, linux.c, windows.c only in their OS

Signed-off-by: Thiago Macieira <thiago@macieira.org>
Add information that goes into the Windows .exe file

And drop the unnecessary .rc file.

Signed-off-by: Thiago Macieira <thiago@macieira.org>
And let qmake create the Mac bundle on its own

It will even parse the Info.plist.in file for us and run sed on it.

Signed-off-by: Thiago Macieira <thiago@macieira.org>