Fixed NPE when NLS root is not defined

#WT-40 fixed work 30m
Add support for docbaseobjectconfiguration

Definition copied from xml's and from WDK dev guide 6.5.
Parameter variants for 'windowsize' for modalpopup must be obtained from 'windowsizelist'
#WT-43 fixed work 1h
Gutter icon "D" for class, used in docbaseobjectconfiguration

#WT-43 fixed
Add support(syntax) for attributelist tag

#WT-42 fixed work 1h 30m
Add note about cloud storage(readme)
fixing typos
Test for primary elements line markes
#WT-22
LineMarker provider for extended and modified primary element.
#WT-22 fixed work 4h
Replace Nls root property by layer root.

Nls root can be obtained from facet. Each facet represents one webtop layer.
Also remove unnecessary test(NlsHierarchy).
#WT-12 work 3h
Return 'parent layer' option

Parent layers now persisted, even if parent facet or module is renamed.
Switched from JDOMExternalizable to PresistedStateComponent for storing facet configuration.
#WT-12 work 5h
Add to WebtoperFacet NLS root API methods

Also rename Utils to WebtoperUtil
and remove getNlsRoots(Module) - now it is unnecessary
since we should obtain facet for PsiElement or VirtualFile.
Add WebtoperUtil.findFacetForElement for this purpose.
Refactoring: NLS name now obtained thought facet-owner
Add todo's
Fix bug with facet renaming
Merge branch 'feature/wt12redesing' into develop
Update wiki about plugin configuration

#WT-12 fixed work 3h