Script documentation generation and UML support (#992)

Documentation is now generated by invoking a shell script
which takes care of all the plumbing.
There is now also support of inlineing PlantUML syntax with
Doxygen. This inlining takes the form of
@startuml{imagename.png}
'PlantUML specific syntax'
@enduml
The inlineing can be made in C syntax comment blocks.
Doxygen will then include the generated UML diagram when
rendering the HTML documentation.
All generated images will be placed under Documentation/img
which is the default search path for Doxygen.

.gitattributes

@@ -10,7 +10,6 @@
 *.xml text
 *.lua text
 
-
 # Denote all files that are truly binary and should not be modified.
 *.png binary
 *.jpg binary
@@ -20,3 +19,4 @@
 *.svg binary
 *.woff binary
 *.epg binary
+*.jar binary