Implement IXLAutoFilter.HiddenRows

Refactor (simplify) filter interfaces: Remove IXLAutoFilter. Rename IXLBaseAutoFilter to IXLAutoFilter. Remove IXLAutoFilter.Set method.

CodeMaid organise and clean autofilter files

Add helper method VisibleRows for autofilters

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).

Use inline out parameters provided by C# 7.2

Small bugfixes and improvements (#782) ...

* Implement IDisposable for XLDataValidations and XLTableField to dispose inner members.

* Expand columns, not rows in ExpandColumns method

* Redundant checks removed, missing checks added

* Avoid null reference and type cast exceptions in Equals methods.

* Redundant check removed; unconditional break from a loop removed.

* Some of the null-checks restored. Aligning fixed.

Add dategroup filtered column. Fixes #701

Breaking change: Change XLCellValues to XLDataType

Unknown changes - something to do with line endings?

Clearing AutoFilter shouldn't throw an exception, even if no AutoFilter is enabled. It should just silently continue.

Project hierarchy cleanup