Do not quote worksheet name with whitespace when saving pivot table worksheet source

Reuse custom file properties part instead of creating new one

Clear all cell contents (formats too) in pivot table range upon loading.

Clear pivot table rendered range upon loading to avoid conflict on rendered cells when opening the file.

Allow pivot tables to have no theme

Pivot table: DateTime type with empty value (Issue #859 fix) (#860) ...

issue #859 : Pivot table: DateTime type with empty value

Update reference files (fills with patternType="none" removed)

Support table sources for pivot tables

Ranges handling redesign (proof-of-concept) (#766) ...

* Immutable range addresses implementation start

* Immutable range addresses implementation continue

* Range addresses made immutable

* Helper methods for range addresses introduced

* XLRangeRepository introduced

* Range factory introduced

* XLRow and XLColumn constructor calls replaced with factory methods.

* Range shifting with no callback actions implemented

* Ranges shifting improved

* Shifting of worksheet data called explicitly. Shifting of CF ranges fixed

* MergedRanges copying removed as it's performed with rows copying. Minor changes in reference file

* Test fixed (arguments reordered)

* Sharing implemented for tables

* Addresses comparison fixed. Formula shifting fixed

* Setters for FixedRow and FixedColumn removed

* Clean-up

* Flaky test fixed.

* Merge conflicts solved

* Make most of the classes non-disposable

* Clean up

* Merged ranges shifting fixed

* Remove redundant variables, clean up usings.

* Restore usings needed for Release configuration. Remove unused constructor (has been replaced with a method in XLWorksheet).

Change XLTable.Theme default value to TableStyleMedium2 to align with Excel

Move reference file to new Other\ folder

Merge branch 'develop' into StylesRebased ...

# Conflicts:
#	ClosedXML/Excel/Ranges/XLRanges.cs
#          ClosedXML/ClosedXML_Tests/Resource/Other/Charts/PreserveCharts/outputfile.xlsx

Don't delete DrawingsPart if there are charts

Move other resource files into Other folder