Codechange: Rename RoadType parameter of MakeRoadDepot

See: #9642

(svn r15601) -Fix [FS#2615]: bridges/tunnels don't store tram owner making it possible to remove someone's tram tracks.
-Feature: allow building road stops on road/tram tracks of competitors.

(svn r14591) -Fix [FS#2388](r14528): cached nearest town could be invalid after importing older savegame and during town generation
-Codechange: rewrite parts of code responsible for caching index of nearest town

(svn r13233) -Fix: Replace some (incorrect) evaluations of TileOwner by RoadOwner.
-Fix: Before evaluating RoadOwner, check if the roadtype is present.
-Fix: Some places assumed that MP_ROAD means normal street.

(svn r12440) -Fix [FS#1694]: Make the road building and road removing conditions more union
-Feature: Allow to build/remove more road-piece combinations directly

(svn r11910) -Fix: play 'ding-ding' crossing sound in more cases (except gameload and crossing construction)
-Fix: crossing sound is bound to tile, not to vehicle

(svn r7759) -Merge: makefile rewrite. This merge features:
- A proper ./configure, so everything needs to be configured only once, not for every make.
- Usage of makedepend when available. This greatly reduces the time needed for generating the dependencies.
- A generator for all project files. There is a single file with sources, which is used to generate Makefiles and the project files for MSVC.
- Proper support for OSX universal binaries.
- Object files for non-MSVC compiles are also placed in separate directories, making is faster to switch between debug and release compiles and it does not touch the directory with the source files.
- Functionality to make a bundle of all needed files for for example a nightly or distribution of a binary with all needed GRFs and language files.

Note: as this merge moves almost all files, it is recommended to make a backup of your working copy before updating your working copy.