Fix PreTeX docs; cache some request data
Fix bugs; update icons
Fix

* Fix PreTeX docs (relative paths)
* Cache EditSelf, GetSelfInfo, GetUserInfo and GetUserInfoAdmin reply data
* Fix sample caching (remove cached source/preview on list update)
* Fix cache clearing
* Rename ExecutionStack into ExecutionContext
* Fix PreTeX for loop
* Add links to plugins Help
Fix; feature

* Add ability to setup sample source from selected text
* Fix auto-setting file name when sending sample
Update versions; update ChangeLogs
TeX Creator v4.0.1

TeX Creator:

* Cache EditSelf, GetSelfInfo, GetUserInfo and GetUserInfoAdmin reply data
* Add ability to setup sample source from selected text
* Fix sample caching (remove cached source/preview on list update)
* Fix cache clearing
* Add links to plugins Help
* Fix auto-setting file name when sending sample

PreTeX Editor Module plugin:

* Fix docs (relative paths)
* Rename ExecutionStack into ExecutionContext
* Fix \for loop