Started work on a well-defined colour model.
Merge branch 'hotfix/github_issue_29' into feature/colour_model
More work on a well-defined colour model.

Prepared the colour classes to work with different colour models.
More work on a well-defined colour model.
Merge branch 'master' into feature/colour_model
More work on a well-defined colour model.

Modified the colour class templates to be palatable for g++.
Implemented a mechanism for automatic version numbering,
Updated comments in povray.h
Merge branch 'release/v1.37.0.0-beta.7' into develop
Merge branch 'master' into develop
Fixed a message box that wasn't quite fitting for a stand-alone build.
Implemented custom seeding of the stochastic pseudo-random number generator.
Added script to auto-generate revision.txt.
Merge branch 'master' into feature/colour_model
More work on a well-defined colour model.
Corrected wrong rotation in `Round_Pyramid_N_in` in shapes3.inc.

Submitted on behalf of Friedrich Lohmueller.
Merge remote-tracking branch 'povray/feature/colour_model' into develop
Auto-generated revision.txt is now ordered by version rather than purely chronologically.
Added CIE L*a*b* conversion macros to `colors.inc`, and added `colors_ral.inc` containing RAL Classic colours.
Update for `colors_ral.inc`.

Added previously undefined RAL_8000 colour.