Action 'Optimize imports' in XQuery removes unused imports

Closes #100
Merge pull request #103 from arnostv/optimizeImportRemovesUnused

Action 'Optimize imports' in XQuery removes unused imports
Null check.
Fix name.
Add allTests task.
Add project level settings for XQuery.
Closes #77 - Project level settings to choose default new files extensions.
Inspection - check if module namespace prefix is same as module file name

Closes #104
Merge pull request #105 from arnostv/inspectionNamespacePrefixFromFileName

Inspection - check if module namespace prefix is same as module file name
Closes #80 - Added parameterized default function and variable namespace per xquery flavour type.
v2.0.0 release