remove all references to synaser

remove everything from comport unit, leave only empty skeleton
implement new comport unit for unix

implement it using the available serial.pp from FPC.
For FPC older than 2.7.x that do not yet have SerReadTimeout()
I just copy-pasted that one function from fpc trunk.
some minor rearrangement of uses and ifdefs
Implement serial port on windows using overlapped io
bump version number to 1.1