This starts the proposed changes in
http://www.pipapo.org/pipawiki/Lumiera/DesignProcess/ApplicationStructure
* Moving all necessary files from src/backend to src/lumiera
* create a small helloworld main app
* setup the buildsystem to build it all
* fix include paths at many places
The testsuite is not yet fixed here, that will be the next commit
* commit 'LUMIERA/master':
Corrected some tabs, missing dependancies in src/gui/Makefile.am
Initial implementation of I-Beam tool. Needs more work
Reinstated a small efficiency
Tidied and simplified video display widget, and added cursor support to
Added a separator between tool groups
Temporarily bodged the icon source directory
Added code to render icons as part of the build process
Added basic support for multiple tools in the timeline view
Implemented new icon workflow
Fixed scroll layout loop bug.
Set the page size of the horizontal timeline scroll bar
Retired VideoTrack - all tracks are the same
uuid's are somewhat standardized, we use our uid's slightly differently,
so change the name not to be confused with standards.
* Small fix for luid generation
* build a 'luidgen' tool which will be used by the interface gen later
* add emacs vars
* include the luidgen tool in automake
