Fix bugs
Fix checking for new version
Reimplement TexsampleWidget; remove Client
Continue reimplement
Continue reimplement
Continue reimplement
Use BProperties
Fix; feature

* Make PreTeX program execution terminatable
* Fix running external applications from PreTeX programs
* Remove unused icons
* Add missing icons
Update PreTeX doc
Fix PreTeX \return function
Update version; update TODO
TeX Creator v4.0.0-alpha