Debugger: Rework type handlers to allow for custom selection.

TypeHandler:
- Add name field for presentation purposes. Adapt subclasses accordingly.

TypeHandlerRoster:
- Add methods to count and retrieve all type handlers for a given type,
and adjust CreateValueNode to allow for passing in an explicit handler.
Adjust callers accordingly.

VariablesViewState:
- Add helpers to store an explicitly chosen type handler for a node.

TypeHandlerMenuItem:
- ActionMenuItem subclass that takes care of reference management
for its contained type handler.

VariablesView:
- Add context menu for choosing type handlers if applicable. Implement
support for invoking said type handlers in a similar manner to explicit
typecasts.
- Adjust saving/restoring the view state so that hidden nodes are taken
into account as well. This is necessary since it may be the case that
the handler had to be applied to the hidden child rather than the visible
node (i.e. the BMessage handler when applied to a pointer to a BMessage).

All together, these changes allow choosing to switch between views of a type
when the Debugger has multiple handlers for it. For example, for BMessages
this allows switching between displaying the raw underlying structure vs
the decoded message content.

Debugger: Fix #13939, more work on #13800.

- Fix various cases where OpenHashTables weren't being cleared properly.
- Fix various reference counting errors.
- Simplify FileManager reference handling.
- Fix bug in LocatableDirectory where the directory named '/' would have its
name returned as empty. This would lead to failed lookups for entries already
in the table, and ultimately corrupted the hash table when deleting unused
entries, leading to #13939. This was previously never noticed due to the
entries not being freed properly.
- AbbreviationTable wasn't clearing its entries.

Debugger: Add ExpressionValues to VariablesViewState.

- VariablesViewState is now able to optionally store previous values
for expression nodes.

Add renderer settings to VariablesViewNodeInfo.

Remember any applied typecasts in VariableViewState.

Preserves and restores typecasts across steps like we already do
for node expansion states.

* Introduced interface UserInterface, which abstracts the user interface code.
* Added implementation GraphicalUserInterface for the current GUI.

TeamDebugger does no longer know about TeamWindow.



git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@33594 a95241bf-73f2-0310-859d-f6bbb57e9c96

Debugger: Add ExpressionValues to VariablesViewState.

- VariablesViewState is now able to optionally store previous values
for expression nodes.

Add renderer settings to VariablesViewNodeInfo.

Remember any applied typecasts in VariableViewState.

Preserves and restores typecasts across steps like we already do
for node expansion states.

* Introduced interface UserInterface, which abstracts the user interface code.
* Added implementation GraphicalUserInterface for the current GUI.

TeamDebugger does no longer know about TeamWindow.



git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@33594 a95241bf-73f2-0310-859d-f6bbb57e9c96