Debugger: Adjustments to report generator.

DebugReportGenerator:
- Due to the changes made with respect to correctly handling switching to
disassembly explicitly, the report generator needs to request loading
source files as it walks the stack trace in order to get source-based
line number information. Fixes crash reports having -1 as the line number
in cases where debug information was available, but the user hadn't yet
looked at the source file in question.

LoadSourceCodeJob:
- Cleanup.

Debugger: Fix regression introduced in hrev50534.

FunctionInstance:
- Add new state FUNCTION_SOURCE_SUPPRESSED. This signals that the user
explicitly forced disassembly to be loaded despite source code being
available.

LoadSourceCodeJob:
- When forced to disassembly, use the above suppressed state accordingly.

SourceView/TeamWindow/TeamDebugger:
- Adjust to take new state into account as needed.

TeamDebugInfo::GetActiveSourceCode:
- When looking at a function to decide whether to return line information
based on source or disassembly, first examine the source code state. If
the source has never been loaded for that function, but we have it available,
set it on the function at that point. This lazily addresses the fact that
LoadSourceCodeJob is called on behalf of a specific function, and
consequently only sets the source code onto that function, and not all others
present in the same file. This allows us to differentiate between the case
where a function doesn't have source code available at all, versus a function
that has simply been forced to disassembly view at this point in time.

The primary symptom of the above issue was that attempting to set a breakpoint
outside of the currently active function, but within the same file would result
in the breakpoints view indicating that the breakpoint was at line 0 rather
than the appropriate line, and breakpoints would also not be drawn in the
source view for such locations.

Thanks to Humdinger for the heads up!

Debugger: Split into core library and application.

- Add subfolder src/kits/debugger which contains the debugger's core
functionality and lower layers. Correspondingly add headers/private/debugger
for shared headers to be used by clients such as the Debugger application
and eventual remote_debug_server. Adjust various files to account for
differences as a result of the split and moves.
- Add libdebugger.so to minimal Jamfile.