v0.15.2

Features:

• Added FOAM_DATE_* template variables (#781)

Fixes and Improvements:

• Dataviz: apply note type color to filter item label
• Dataviz: optimized rendering of graph to reduce load on CPU (#795)
• Preview: improved tag highlight in preview (#785 - thanks @pderaaij)
• Better handling of link reference definition (#786 - thanks @pderaaij)
• Link decorations are now enabled by default (can be turned off in settings)