(svn r7685) - Prepare 0.5 branch for release. Update readme's, bugs, installers, changelog, etc. to 0.5.0-RC2

(svn r7684) -Backport from trunk (r7620):
- Bad signal update through incompatible rail types, bridge.

(svn r7683) -Backport from trunk (r7552, r7553, r7574, r7581, r7601, r7611, r7654, r7658):
- Language file updates.
- Untranslated strings: Turkish (2), Swedish (1), Romanian (3), Norwegian (2),
Icelandic (217!), Hungarian (2), German (1), Galician (173), Finnish (26),
Danish (23), Czech (34), Bulgarian (39), Brazilian-Portugese (3)

(svn r7682) -Backport from trunk (r7539, r7541, r7603):
- Added esperanto language files to MS projects (r7539).
- Polish townname generator uses proper UNICODE characters (r7603).

(svn r7681) -Backport from trunk (r7585, r7590, r7599):
- Drastically reduce CheckStationSpreadOut CPU usage which got called way too much by the AI.

(svn r7680) -Backport from trunk (r7586):
- Remove landscaping toolbar from road-toolbar in scenario editor

(svn r7679) -Backport from trunk (r7628):
- [YAPF] suppress 'Train is lost' message if pathfinding ended on the first
two-way red signal

(svn r7678) -Fix (r7674): DEBUG macro has been changed

(svn r7677) -Backport from trunk (r7657):
- 'Goto Depot' did not work for helicopters going to an airport without depot

(svn r7676) -Backport from trunk (r7630, r7631):
- cur/old economy memmove magic (r7630).
- wrong pointer arithmetic that totally corrupted animated_tiles table, desyncing
between different endiannes-machines in multiplayer (r7631).