Tabs are now emitted in class definitions.
Fix `IDE.st` that had tabs removed.
Merge pull request #412 from herby/fix-tabs-class-definitions

Fix tabs class definitions
Optimized StringStream >> nextPutAll:

In the 99% of cases, nextPutAll: appends to end of StringStream.
But the whole previous contents for nevertheless copied
at every invocation.
Merge pull request #413 from herby/optimize-stringstream-nextputall

Optimized StringStream >> nextPutAll:
Fixed input rendering
Merge branch 'master' into helios
Added back HLMoveMethodToCommand activation testing
Merge remote-tracking branch 'refs/remotes/ben/helios' into helios

Conflicts:
	js/Helios-KeyBindings.deploy.js
	js/Helios-KeyBindings.js
	st/Helios-KeyBindings.st
Completed merge with ben/helios
input working more or less