(svn r1620) Fix typo in r1619

(svn r1619) Fight bit rot in the Makefile:
- Begin all echos with ===> to visually emphasise them
- Add @ to suppress printing of commands where it was missing
- Add echos to rules where none were
- Rephrase some existing echos
- Remove VERBOSE_FILTER, because piping errors to /dev/null is ... a bad idea

(svn r1618) () -> (void)

(svn r1617) -Fix: Ugly hack to only call ResetObjectToPlaceon childwindows of build-toolbar if the window is closed manually (with 'X'); if not checked ResetObjectToPlace is called twice resulting in undesired actions (eg. clicked button is unclicked immediately).

(svn r1616) Introduce ttd_strlcat() and use it to de-uglify some piece of code in misc_cmd.
While here rename the len parameter of ttd_strlcpy() to size, because it is a buffer size and not a string length.
Also add -Wwrite-strings to the Makefile, because the above mentioned piece of code was the only part which triggered this warning.

(svn r1615) -Fix: [1107350] console ignoring return character occasionally. For everyone that is running 2 dedicated servers on 1 windows machine, console input is now correct (event was the same so it was random which console received the input)

(svn r1614) Fix: Signals were not updated correctly when the vehicle drive side was changed

(svn r1613) -Fix: WE_CLICK event is not called on default actions. If special action is needed, use the other events like WE_RESIZE or WE_DESTROY, etc.

(svn r1612) -Fix: made sure that ->next pointers are set to NULL

(svn r1611) Display server port in the multiplayer game info window
I had to make the multiplayer window 10 pixels wider for this