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Change TreeContainer factory to support various tree types genericially

See merge request !90

Construct all elements of a tree-container storage

Add resize function to TreeContainer

Add possibility for dynamic tree traversal

See merge request !85

Fix deprecation warnings

See merge request !89

whether to make a dynamic or static traversal dependent on interface properties of the
tree type. This is done by checking tree-traversal concepts DynamicTraversalConcept
and StaticTraversalConcept.

Deprecate forEachNode with multiple callbacks

See merge request !88

Remove warning: variable 'childTreePath' set but not used

See merge request !87

Modernized tree traversal using c++17 constexpr_if

See merge request !51

remove the warning: comparison of integer expressions of different signedness, in childextraction

See merge request !84

Fetch default yml files via different project instead of url

See merge request !82

This is a workaround for a bug that showed up after gitlab migration. See issue
infrastructure/issues0#62 for further discussion.

Merge branch 'remove-last-traces-of-treepath' into 'master'

ref:staging/dune-typetree\> we remove specializations of TreePath, as this now
only an alias and this the HybridTreePath version matches.

See merge request [!80]

  [!80]: gitlab.dune-project.org/staging/dune-typetree/merge_requests/80

we remove specializations of TreePath, as this now only an alias and
this the HybridTreePath version matches.

Merge branch 'static-treepath' into 'master'

ref:staging/dune-typetree\> We introduce an alias StaticTreePath<i,...>
referring to the corresponding HybridTreePath<integral_constant<i>,...>.

The old (superseeded) static TreePath<i,...> is now deprecated and will be
removed after 2.7.

The StaticTreePath will stay as a convenience alias.

(related to [#10])

See merge request [!75]

  [#10]: gitlab.dune-project.org/NoneNone/issues/10
  [!75]: gitlab.dune-project.org/staging/dune-typetree/merge_requests/75

We introduce an alias StaticTreePath<i,...> refering to the corresponding HybridTreePath<integral_constant<i>,...>.

The old (superseeded) static TreePath<i,...> is now deprecated and will be removed after 2.7.

The StaticTreePath will stay as a convenience alias.

Merge branch 'feature/merge-treepath-classes' into 'master'

ref:staging/dune-typetree\> This removed the explicit implementation of
TreePath<i...> and makes it an alias for HybridTreePath<index_constant<i>...>.
While it is intended that TreePath is completely removed, there might be
incompatibility issues if downstream modules switch to HybridTreePath but
their users still use TreePath. Such issues should be avoided by this patch.

See merge request [!71]

  [!71]: gitlab.dune-project.org/staging/dune-typetree/merge_requests/71

Merge branch 'feature/drop-fallback-std-stuff' into 'master'

See merge request [!73]

  [!73]: Nonestaging/dune-typetree/merge_requests/73

Merge branch 'feature/remove_child_storage' into 'master'

ref:staging/dune-typetree\>

### Summary

Cleanup the child(),childStorage() node member functions and corresponding
free functions and removed type aliases ChildStorage and ConstChildStorage
from node implementations

### Details

-   The child-storage is in all node implementations a shared_ptr of the child
    type. This is even implicitly assumed in several methods, like setChild().
    So it does not make much sense to allow flexible child storage types.
-   The child-extraction methods `childStorage(node, i...)` are not
    consistently implemented like `child(node, i...)` and several type aliases
    or free functions are missing, so this MR cleans this up.
-   The member functions node.childStorage(i) were not implemented correctly
    in all node implementations. But they cannot be removed right now because
    they are used in the tree transformation methods.
-   The node.childStorage(i) now consistently take an integral-constant or a
    runtime index as first argument. This allows for more generic
    implementations.

### To Do

-   [x] Check compatibility with dune-pdelab
-   [x] Check compatibility with dune-functions

See merge request [!72]

  [!72]: gitlab.dune-project.org/staging/dune-typetree/merge_requests/72

removed free function childStorage() and type aliases ChildStorage and ConstChildStorage from node implementations

[!65] removed unnecessary constructors and use implicitly generated constructors instead in TreeContainer

Merge branch 'issue/treecontainer_constructors' into 'master'

ref:staging/dune-typetree\> This MR essentially applies the rule of zero to
the TreeContainerVectorBackend class and allows to copy this container.

See merge request [!65]

  [!65]: gitlab.dune-project.org/staging/dune-typetree/merge_requests/65