Fix 2fd90960: Missing default vehicles and industry acceptance/production. (#12000)

* Fix 2fd90960: Missing default vehicles and industry acceptance/production.

Some default definitions are used across multiple climate types and relied on climate-independent cargo slot even though they specified a climate-dependent cargo type.

Add MixedCargoType that indirectly allows multiple labels to be specified for these.

Change: Decouple and remove landscape-dependent cargo types. (#11719)

Cargo types of default engines, industries and houses are now specified in terms of label.

Fix: Don't assume engclass 2 should be elrail. (#10315)

When disabling/enabling elrail, there is an assumption that `engclass` of 2
means the engine will run on elrail. While this holds for default engines,
NewGRFs can do other things.

To resolve this we store the intended railtype so that toggling elrail will
restore to the correct type.

Change: Support flipping shorter engines without NewGRF support. (#10262)

* Change: Support flipping shorter engines without NewGRF support.
* Cleanup: Remove write-only prop27_set temporary flag.

(svn r17758) -Revert (r17208): Use assert_compile() if you cannot count.
-Fix (r7326): Powernaut Helicopter got wrong 'load amount'.
-Fix (r2639): Call the Evil by its name.

(svn r11822) -Codechange: Replaced fixed size custom name array. Names are now attached to their object directly and there is
no limit to the amount of names.
-Fix: NewGRF engines could not be renamed.

(svn r8455) -Codechange: Give a more meaningful name (railveh_type)to member flags of RailVehInfo, as well as changing the code to reflect the fact that it was not a flag but rather a one value only variable. Doing so, some evaluations have been simplified.
-Codechange: Add and use RAILVEH_SINGLEHEAD when railveh_type is set to 0, which was implicit before.
-Cleanup: Remove some extraneous parenthesis.

(svn r8385) -Fix

-Regression (r8314): I only did half the necessary changes to move railtype from Engine to RailVehicleInfo. Now do the rest.

(svn r8321) -Fix

Reduce the size of EngineInfo (from 28 to 24 bytes) by moving one of its attributes

(svn r8314) -Fix

-Codechange: Move the railtype from EngineInfo to RailVehicleInfo, because having a railtype for non-rail vehicles isn't that useful

(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.