Merge branch 'master' into dev

Merge branch 'master' of https://github.com/leon-thomm/Ryven

Merge pull request leon-thomm#24 from leon-thomm/builtin-console

I just implemented a complete built-in python console interpreter, allowing REPLs and direct access to individual NodeInstances. This way, the user can very efficiently customize nodes and keep track on internal variables. Altough this initially might seem like just another nice feature, it is definitely going to become one of the major ones, the possibilities are endless. More in the upcoming release.

Merge branch 'master' of https://github.com/leon-thomm/Ryven

Merged examples, fixed checkpoint bug

And added logs in Ryven_Console, so that all their method calls are also blocked and don't lead to any errors.

changed docstrings in env import files

checkpoint nodes!

personalized algorithm and sync modes for flows

Every flow now has his personal settings are for algorithm mode and viewport update synchronization mode since choosing an appropriate algorithm mode seems to be a necessity with a lot of algorithmic flows. These settings get saved and loaded to and from project files, backward compatibility is given. I am going to add an explanation of this situation to the docs.

nodes fine grinding and changed theme update procedure (temporary)

I tried to reimplement the theme update procedure using Qt signals but constatly using this approach leads to an issue descibed in the constructor of MainWindow which will probably force me to change the theme update procedure back for NodeInstances and their title label to using direct methods instead of sinals&slots.

I also changed the file extensions and fixed some smaller bugs.

Merge pull request leon-thomm#12 from leon-thomm/shadows-for-node-ins…

…tances

Animations and new design!