Updated Readme latest release version

Updated Changelog, addon version

Updated Readme

Added addon updater, Updated readme

Merge pull request aachman98#64 from aachman98/v3.0-alpha

V3.0 alpha

Updated AddonUpdater

Fetch content from v2.1 branch

Updated Readme

New playlist link

Fixed Material node

Last commit before v2.0.0 (all categories ported)

Fixed:
AddonUpdater class - forward slashes

Updated:
Socket base class - output sockets use an existing prop from node to return data (commented)
New Print node - universal input/output and option to print list
New FloatVector & AngleVector - uniform axis options
New BeginForLoop & EndForLoop nodes - added info socket for better communication between nodes

Added:
New "Info" socket type - flow control information transfer
toList() function - global scope
New Random nodes - Float, Int, Bool, Angle
New CustomMesh input node
New BeginForEachLoop & EndForEachLoop nodes - improved versions (use info socket nodes)
New If node - branch flow control using condition (bool)

NOTE: all classes from old system are commented