A3DGE Code

* Fixed GetVectorLength2 (Duh!).
+ Added property "Transparent" to models.
* World3D tries to render transparent and translucent objects properly but it
fails (for example: set a3dge.world3d.MaxTransparentObjects = 255 and
ex_text.NumObjects = 256).

* Combined TMesh3D and TPolyhedron in a single class. Also moved part to
TTexturedPolyhedron and simplified the Render methods.
* Fixed rotation in ex_test.
* Documentation fixes and updates.

* Changed miramar.png to a better version.
* Roadmap revision.
* Fixed a warning in a3dge.skybox.pas.

+ Added function CreateBox and rewritten CreateCube to fix issues and to add
texture mapping.

+ Added frame property to TObject3D.
* Improved TBillboard adding animation support.
+ Added example "ex_hello" that shows the minimal A3DGE application.

* Swapped exectution order of current and global states.
* Fixed TA3DGEApplication.SetTicksPerSecond: it didn't manage event
registration correctly.
+ Added a "frame counter" to the examples that shows the FPS rate.
+ Added comments to the ex_heightmap example.
* Some fixes in documentation and messages.

+ Added scale properties to THeightmap.
+ Added a command line parameter to ex_heightmap to allow to select a different
map.

+ New sample heightmap.
+ Added option to cap3d and plasma to change the "fractal sharpen" value.
+ Added option to cap3d and hm2bmp to set a "sea level" (i.e. min height).
* Fixed palette selection in cap3d (char case!).
+ Added a few missing error messages to cap3d.

* Replaced random generator of plasma so it can repeat maps if same seed is
used.
+ Added options to cap3d and plasma to select map size and random seed.
* Fixed cap3d to manage data better.
* Fixed hm2bmp "black snow" bug.
* Fixed hm2bmp to manage data loading errors.

+ Added front-end program for cap3d.
* Created Lazarus project files for all cap3d components.
* A small fix on Heightmap to prevent rendering too small heightmaps.