Debugger: add DWARF5 attribute and form definitions

Introduce new attribute classes:
* addrptr represents an offset into the .debug_addr_section
* loclist represents an offset or an index to a location list
* rangelist represents an offset or an index to a range list
* stroffsetsptr represents an index to the indirect string table

The semantics of some existing attribute classes changed:
* loclistptr represents an offset into the
.debug_loc / .debug_loclist section
It will be used only when setting loclists_base attribute.
In all other places we should use loclist attribute class.
* rangelistptr represents an offset into the
.debug_ranges / .debug_rnglist section
It will be used only when setting rnglists_base attribute.
In all other places we should use rangelist attribute class.

Define lookup table for new DW_AT_* attribute types
* change the existing references to AC_LOCLISTPTR to AC_LOCLIST
as in those places now either an index or an offset can be accepted
(previously there were no indexes, only offsets everywhere)
* only DW_AT_loclists_base uses AC_LOCLISTPTR
* similarly for AC_RANGELISTPTR and AC_RANGELIST as ranges
can be specified using either an index or an offset
* only DW_AT_rnglists_base uses AC_RANGELISTPTR

Define lookup table for new DW_FORM_* attribute forms
* similar reshuffle for location lists and range lists

Change-Id: I78d307889cd6082a19870afdc571dc0c83d19644
Reviewed-on: https://review.haiku-os.org/c/haiku/+/6982
Tested-by: Commit checker robot <no-reply+buildbot@haiku-os.org>
Reviewed-by: Adrien Destugues <pulkomandy@pulkomandy.tk>
Reviewed-by: waddlesplash <waddlesplash@gmail.com>

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.