allow negative min/max values for sliders (fix #285)
allow percent symbols in custom block texts (fix #361)
fix #566
remove log
added history
Refactor variables handling

introducing Variable objects, all functionality stays the same at this
time
fixed #174, eliminate UpvarReferences in evaluator

replace UpvarReferences with references to Variable objects, fixes
upvar scope issues
Mutable upvars

allow upvars to be SET and CHANGEd
fixed #585

Thanks, Michael, for reporting this!
correct small errors in localization strings and add a few new Portuguese translations
fixed #591

fully copy local variables for sprite duplicates and (Scratch-like)
clones
Merge pull request #589 from MMSequeira/master

correct small errors in localization strings and add a few new Portuguese...
Portuguese translation update, thanks, Manuel!
fixed #590 (Russian translation syntax glitches) Thanks @alexf2000 !
Merge pull request #571 from Hardmath123/bucket-color

Bucket color issue
Paint: flood fill issue fixed, thanks, Kartik!
Add missing comma. (Sorry Jens!)

I did not properly test my chages... Sorry about that! Can you please release the correct version?
Merge pull request #592 from MMSequeira/patch-1

Add missing comma. (Sorry Jens!)
fixed #593

match broadcast numbers with event hat blocks containing strings that
can be parsed as numbers
Merge pull request #548 from Gubolin/issue_361

allow percent symbols in custom block texts (fix #361), thanks again @Gubolin, both for the fix and for your patience!