Private update



See merge request !85

Only type plugins and the core will access the update function

specification of additional libraries for each plugin to be linked into the core.

also update logo in user documentation sources



See merge request !83

fixes #32 by applying the patch provided by a dielen.

ps: i am still missing around 700 mb mrmory from the provided information, but this is better than before

See merge request !69

New gl loader

on this branch glew was replaced by glLoadgen
Even though the build runs on all platforms, excessive testing should be performed (old opengl cards new ones, runtime tests etc.)
closes #20 

@moebius you probably want to check for code Quality before merging this one.

See merge request !66

Removed FreeFont stuff



See merge request !73

meminfo should be as accurate as around 100mb

ps: i am still missing around 700 mb mrmory from the provided information, but this is better than before

* hopefully everything should be ready to be merged now

refactorAlignMeshes

DONE: change icons of the new buttons and remove redundant functionality from align meshes plugin
also added an icon for align meshes.

ready to be merged
merry Christmas!

See merge request !49

* added icon for mesh alignment (Magnet icon cc0 graphic from https://pixabay.com/en/magnet-horse-shoe-poles-north-312777/

* changed scale icons since i found the svg file ;)

closes #24

* added missing ifdef
* added ifdef for init functions as apple needs no gl loader
* include qgl instead of glloadgen header on apple systems

compilation on Apple works, however there is a segfault which needs further investigation.