(svn r7212) -Codechange (FS#409): Update Turkish town name generator with Turkish characters (jnmbk)

(svn r7211) -Codechange: Update all languages to use SMALLLEFTARROW/SMALLRIGHTARROW, as per english.txt, for GUI elements

(svn r7210) -CodeChange: [YAPF] the global cache object is now not destroyed/recreated whenever the cache is invalidated. It now supports Flush() method that is used instead. It should also fix mem-leak warning produced by valgrind (Tron)

(svn r7209) -Codechange: Alter position of scroll bar in the station list; the filter line isn't scrollable...

(svn r7208) -Revert [r6040]: Remove double-click action in minimap and reintroduce lmb-scrolling (Rubidium)

(svn r7207) -Codechange: Pass the (unchanged) windowpointer to the console window and do it only once.

(svn r7206) -Codechange: Remove (some of) the magic needed for windows that could be invalid after
a call to DeleteWindow() somewhere else. Also do some cleanup with AllowWindowDescFront()

(svn r7205) -Fix [FS#350, SF#1560913]: Window allocation and deletion messed with the actual window
structs inside their array, and possibly invalidating pointers higher up.
Meaning that any function called within an wndproc could cause unknown/invalid pointers
once control was returned to this function. Solved by the introduction of an extra
abstraction layer, an array of z-window positions that is only concerned with the
pointers.

(svn r7203) -Cleanup: Donnu what Miham was smoking there, but removed it (assert_compile + 3)

(svn r7202) -Codechange: Move _viewports and _active_viewports local to viewport.c and have them
called from the appropiate places in window.c